Factory Equipment Dilemma

Octavia the octopus wants to start a company that manufactures desk chairs. There are 3 different tiers of machinery that she can buy.

Tier 1 machinery: Fixed cost of $200,000 and costs $28 per chair.
Tier 2 machinery: Fixed cost of $360,000 and costs $22 per chair.
Tier 3 machinery: Fixed cost of $500,000 and costs $14 per chair.

Which piece of machinery should she buy if she wants to build 20,000 desk chairs for the least amount of money?

Tier 3 machinery They are all the same Tier 1 machinery Tier 2 machinery

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34 solutions

Prasun Biswas
Feb 22, 2014

Simple arithmetic calculation is required to solve this. If the upfront cost be x n x_n and cost per chair be y n y_n for the n n th tier machinery, the cheapest machinery would be the n n th machinery for which the value of x n + ( 20000 × y n ) x_n+(20000\times y_n) is the lowest.

I don't think that I need to show the full calculation as all of you can calculate the value of x n + ( 20000 × y n ) x_n+(20000\times y_n) for the n n th tier machinery from the values given in the problem. On calculating, we get--

For n = 1 n=1 , the cost is $ 760000 \$760000 , for n = 2 n=2 , the cost is $ 800000 \$800000 and for n = 3 n=3 , the cost is $ 780000 \$780000 . So, we get the cheapest value for n = 1 n=1 . Thus, Tier 1 machinery is the cheapest .

i thought tier 3 is the cheapest

Waqas Nasir - 7 years, 3 months ago

Awesome solve

Shahin Alam - 7 years, 2 months ago

Tier 1 is the Cheqpest

Muhammad Hussain - 7 years, 2 months ago

Tier 1 is the correct answer as the total expenditure will be $76,000 which is the cheapest

Tushar Malik - 7 years, 2 months ago

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The expenditure on Tier I machinery will be $ 760000 \$760000 not $ 76000 \$76000 !!

Prasun Biswas - 7 years, 2 months ago

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Oh sorry! By mistake I forgot to put one more zero

Tushar Malik - 7 years, 2 months ago

Tier 1 is the cheqpest

Armish Muzaiyub - 7 years, 2 months ago

tier 1 is the cheapest

Dini Lutfi - 7 years, 2 months ago

That's It!!!

YASH KASAT - 7 years, 3 months ago

I wonder if theres another way of actually doing this question without trial and error.

Victor Song - 7 years, 3 months ago

great

Fasal Kader - 7 years, 3 months ago

Got it wrong :(
I genuinely thought that it was all the same, seeing that the more the quantity of 1 chair, the more the price of lots of chairs.

Saarah Hussain - 7 years, 3 months ago

i took the wrong train !!!! divided machine cost by cost per chair n found 2machine as most usefull one

vatsal Rajgor - 7 years, 3 months ago

good

Srini Vasan - 7 years, 3 months ago

all are the same

Zain Kazimi - 7 years, 3 months ago

In this case Tier 1 machinery is the cheapest. If more than 20000 of chairs are supposed to be made then Tier 3 machinery would be the Cheapest.

TheSantosh Mehta - 7 years, 3 months ago

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That might be, but I didn't check it. However, that isn't part of this problem!! But still, it is a good insight !! :)

Prasun Biswas - 7 years, 3 months ago

tier1 is cheapest

Ali Mohammad Jamro - 7 years, 2 months ago

tier 1

Muhammad Usman Azeem - 7 years, 2 months ago

tier 1.

Kasfia Chowdhury - 7 years, 2 months ago

yer

alistar cook - 7 years, 2 months ago

tire 3 is the cheapest

Bushra Qasim - 7 years, 2 months ago

got it right away!

Ernest Ubor - 7 years, 2 months ago

1

Mirza Boxer - 7 years, 2 months ago

TIER 1

Samiul Newaz - 7 years, 2 months ago

wow, what a complete solution, i solved it using comparing

Jonathan Moey - 7 years, 2 months ago

brute force all the way :D

Kenny Gozali - 7 years, 1 month ago

Tier 1 is the cheapest, of course.

Bruna Torman - 7 years, 2 months ago

good prasun..

zarree khan - 7 years, 2 months ago

Tier 1: $200,000 upfront + $560,000 total (28 × \times 20,000) = 760,000
Tier 2: $360,000 upfront + $440,000 total (22 × \times 20,000) = 800,000
Tier 3: $500,000 upfront + $280,000 total (14 × \times 20,000) = 780,000

Tier 1 machinery is cheapest.

its quiet easy

Parag Sharma - 7 years, 3 months ago

good one

vatsal Rajgor - 7 years, 3 months ago

good i also tried this

Velu Rajamanikam - 7 years, 3 months ago

I got it exactly that way

Jhan Deguzman - 7 years, 3 months ago

Tier 1: $200,000 upfront + $560,000 total (28 20,000) = 760,000 Tier 2: $360,000 upfront + $440,000 total (22 20,000) = 800,000 Tier 3: $500,000 upfront + $280,000 total (14 20,000) = 780,000 so tier 1 is cheap.............

Saketh Nakka - 7 years, 3 months ago
Maricar Santilla
Mar 5, 2014

just a simple solution let A become your machinery 1 so the upfront cost be X and per chair is Y so Ax+(Ay x 20000) Machinery 2 represents B so Bx+(By x 20000) and machinery 3 is Cx+(Cy x 20000)

therefore An=$760000 Bn= $800000 Cn= $780000 meaning the cheapest machinery is machinery 1 which has a cost of $760000

yup number 1is cheapest

Cuggoo Ali - 7 years, 2 months ago
Philippe Arnoux
Mar 5, 2014

Coût de la machine 1 : 200 000 $ + (28 $ x 20 000 chaises) 560 000 $ = 760 000 $ Coût de la machine 2 : 360 000 $ + (22 $ x 20 000 chaises) 440 000 $ = 800 000 $ Coût de la machine 3 : 500 000 $ + (14 $ x 20 000 chaises) 280 000 $ = 780 000 $

La solution la plus économique est la machine n° 1.

good one

Srini Vasan - 7 years, 3 months ago
Mina Samy
Apr 26, 2014

Tier 1 is the cheapest :) though on the long run Tier 3 is the best choice because when you increase the number of produced chairs it gets more cheaper then, that is why the problem states only 20,000 chairs because it is at the break point where tier 3 surpasses all other choices

Ashish Jha
Apr 26, 2014

you just had to calculate the cost of the upfront + cost of making 20000 chairs And the cheapest one will be tier 1

Siva Kontham
Apr 17, 2014

First know the cost for 20,000 chairs

if bye first machinery total amount total cost for chairs=20000 28=560000 total amount = chairs cost for built + machinery cost = 560000+200000=760000 if bye second machinery total amount total cost for chairs=20000 22=440000 total amount = chairs cost for built + machinery cost =440000+360000=800000 if bye second machinery total amount total cost for chairs=20000*14=280000 total amount = chairs cost for built + machinery cost =280000+500000=780000

so answer is first machinary

Michael Naiem
Apr 12, 2014

teir #1 First = 200.000+(28 20000) = 760.000 Second = 360.000 + (22 20000) = 800.000 Third = 500.000 + (14*20000) = 780.000 that's teir one the cheapest

Sadia Sajid
Apr 2, 2014

tier 1 is the cheapest

Abdul Turk
Mar 30, 2014

Tier 1 is the cheapest

Anzar Aznzar
Mar 29, 2014

200 000 + ( 28 * 20 000 ) = 760 000

360 000 + ( 22 * 20 000 ) = 800 000

500 000 + ( 14 * 20 000 ) = 780 000

Henrique Ribeiro
Mar 25, 2014

Tier 1 = 200000 + 28 x 20000 = 760000 Tier 2 = 360000 + 22 x 20000 = 800000 Tier 3 = 500000 + 14 x 20000 = 780000

The best price is the Tier 1.

Alok Ashu
Mar 21, 2014

tier 1 costs 28 per chair, its upfront cost is 200000 so we have to make 20000 chairs so (28X20000+200000)=760000 tier 2 costs 22 per chair, its upfront cost is 360000 so we have to make 20000 chairs so (22X20000+360000)=800000 tier 3 costs 14 per chair, its upfront cost is 500000 so we have to make 20000 chairs so (14X20000+500000)=780000 so tier 1 is the cheapest

Abhinav Ankur
Mar 21, 2014

Tier 1 is the answer

Azmain Yousuf
Mar 20, 2014

Tier one is the cheapest. 1

Azaj Vahora
Mar 20, 2014

tier 1 is cheapest

Santosh Mahajan
Mar 18, 2014

Tire 1 as the upfront cost + Manufacturing cost is lowest.

Khandakar Rahman
Mar 16, 2014

Tier 1, will be the less total cost as 28 x 20000 + 200,000 = 760,000 .

Haq Nawaz
Mar 16, 2014

just multiply the cost per chair to total no of chairs required and then and it to machine cost. then find the least value

Anurag Pandey
Mar 15, 2014

for tier 1 machine total cost =28 20000$+200000=760000$. for tier 2 machine total cost =22 20000$+360000=800000$. for tier3 machine total cost =14*20000+500000=780000$. so in cost tier1<tier2<tier3 so answer is tier1.

Joydhi Telmo
Mar 15, 2014

I just divided all machinery cost to 20,000 and add the cost per chair and choose the cheapest cost per chair

Tier 1 = (200,000/20,000)+28 = 38

Tire 2 = (360,000/20,000)+22 = 40

Tier 3 = (500,000/20,000)+14 = 39

So TIER 1

Suresh Visweswara
Mar 12, 2014

machinery 1 is cheapest

Raju Padsalge
Mar 12, 2014

For machinery 1 the cost is $200,000 + (20000 * 28) = $7,60,000

For machinery 2 the cost is $360,000 + (20000 * 22) = $8,00,000

For machinery 3 the cost is $500,000 + (20000 * 20) = $7,60,000

So the machinery 1 is the cheapest

200000+28 20000=760000 360000+22 20000=800000 500000+14*20000=780000

Rakesh Rc
Mar 10, 2014

Tier 1 is the cheapest

Tier 1: $200,000 upfront + $560,000 total (28 20,000) = 760,000 Tier 2: $360,000 upfront + $440,000 total (22 20,000) = 800,000 Tier 3: $500,000 upfront + $280,000 total (14 20,000) = 780,000

Naren Prem
Mar 10, 2014

Good One

Laxman Selvam
Mar 9, 2014

the total cost = upfront cost + cost per chair *20000 the tier 1 machinery has the lowest total cost, $760000 and hence octopus must go for it.

just remove the 10000s from upfront cost and no of chairs to simplify calculation.. Keep the number of chairs as 2.

Tier 1 = 20+28*2= 76 Tier 2 = 36 + 22 *2 = 80 Tier 3 = 50 + 14 *2 = 78

Rahul Gaur
Mar 7, 2014

200,000+28 20,000=760,000 360,000+22 20,000=800,000 500,000+14*20,000=780,000

Tier 1 is the cheapest since:

Tier 1: $200,000 upfront + $560,000 total (28 * 20,000) = 760,000 Tier 2: $360,000 upfront + $440,000 total (22 * 20,000) = 800,000 Tier 3: $500,000 upfront + $280,000 total (14 * 20,000) = 780,000

Malouh Gaganao
Mar 6, 2014

tier 1 machinery;upfront cost of $200,000 and costs 28$ per chair = $200028 tier 2 machinery;upfront cost of $200,000 and costs 28$ per chair = $360022 tier 3 machinery;upfront cost of $500,000 and costs 14$ per chair = $500014

my answer is tier 1 machienery

Sudhakar Sapram
Mar 5, 2014

Tier 1: $200,000 upfront + $560,000 total (28 20,000) = 760,000 Tier 2: $360,000 upfront + $440,000 total (22 20,000) = 800,000 Tier 3: $500,000 upfront + $280,000 total (14 20,000) = 780,000

Annu Ben
Mar 5, 2014

1st =200000+28 20000=400056. 2nd=360000+22 20000=720044. 3rd=500000+14*20000=100002. cheapest is 1st tier machinery .

Vipin Rathore
Mar 4, 2014

For tier 1: $200,000 + $560,000 total (28 * 20,000) = 760,000 For tier 2: $360,000 + $440,000 total (22 * 20,000) = 800,000 for tier 3: $500,000 + $280,000 total (14 * 20,000) = 780,000

So we can say that tier 1 machinery is cheapest.

Obviously, Tier 1 is the cheapest.

Tofazzal Islam - 7 years, 3 months ago

So we can say that tier 1 machinery is cheapest

Fahima Rahman - 7 years, 2 months ago

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