A problem for a friend III

If I can exchange 1 S ingapore D ollar 1 \ \mathfrak{S} \text{ingapore} \ \mathfrak{D} \text{ollar} for 25 T hai B aht 25 \ \mathfrak{T} \text{hai} \ \mathfrak{B} \text{aht} , and I can also exchange 2.5 M alaysian R inggit 2.5 \ \mathfrak{M} \text{alaysian} \ \mathfrak{R} \text{inggit} for 1 S ingapore D ollar 1 \ \mathfrak{S} \text{ingapore} \ \mathfrak{D} \text{ollar} , how much R inggit \mathfrak{R} \text{inggit} can I buy if I sell 100 B aht 100 \ \mathfrak{B} \text{aht} for R inggit \mathfrak{R} \text{inggit} ?

Image Credit: Wikimedia Money Exchange
Indeterminate 25 10 2.5 1

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1 solution

Jake Lai
Mar 14, 2015

The SGD-MYR exchange rate and the SGD-THB exchange rate do not determine the THB-MYR exchange rate.


Edit: As Chew-Seong Cheong pointed out, "exchange" is an unclear word. What I meant was "buy"/"sell". You can exchange THB for SGD then SGD for MYR, but the selling rate may differ.

DAMN ! \boxed{\huge \text{DAMN !}}

Vaibhav Prasad - 6 years, 3 months ago

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Did you answer 10? :"(

Hrishik Mukherjee - 6 years, 2 months ago

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Yes....and got stumped !!!

Vaibhav Prasad - 6 years, 2 months ago

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@Vaibhav Prasad

Money_Matters

Hrishik Mukherjee - 6 years, 2 months ago

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@Hrishik Mukherjee WHAT ARE YOU TALKING ABOUT ???? WHAT MONEY MATTERS ??? WWHAAAT ?????

Vaibhav Prasad - 6 years, 2 months ago

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@Vaibhav Prasad If you forgot to laugh, then what's the need of broadcasting your feelings publicly :P

Hrishik Mukherjee - 6 years, 2 months ago

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@Hrishik Mukherjee YOU REALLY WANT TO FIGHT ???? OK

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YOU START

Vaibhav Prasad - 6 years, 2 months ago

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@Vaibhav Prasad Feeling Sleepy Man.. Not a topper like you who studies the whole night :p

Hrishik Mukherjee - 6 years, 2 months ago

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@Hrishik Mukherjee THIS IS NOT CALLED FIGHTING............... I THOUGHT YOU WANTED TO FIGHT !!!!!!!!!

Vaibhav Prasad - 6 years, 2 months ago

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@Vaibhav Prasad You are thinking too much lately.. Stop studying 24x7 and go get some sleep.

Hrishik Mukherjee - 6 years, 2 months ago

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@Hrishik Mukherjee HAVE YOU GONE CRAZY ???? WHO STUDIES 24/7

Vaibhav Prasad - 6 years, 2 months ago

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@Vaibhav Prasad You...42,000 point :O :O .. Super Topper

Hrishik Mukherjee - 6 years, 2 months ago

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@Hrishik Mukherjee Stop it with the "topper" bullshit !!

Vaibhav Prasad - 6 years, 2 months ago

same feeling here man

Suprem s.nalkund - 6 years, 3 months ago

Not a clear question. Strictly if you say you can "exchange" in its widely accepted English sense. We can always exchange 100 THB with 4 SGD then exchange the 4 SGD with 10 MYR. That is why, money changers (not exchangers) and banks use buy and sell instead of exchange.

Chew-Seong Cheong - 6 years, 3 months ago

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Yup, thank you for pointing that out to me. I've replaced the last few instances of "exchange" with the appropriate vocabulary!

Jake Lai - 6 years, 3 months ago

But market forces would bring the exchange rate of MYR - THB to 1 : 10 1 : 10 . If it was greater than that say 1 : 11 1 :11 ,

(i) I could exchange x x MYR for 11 x 11x THB,

(ii) exchange 11 x 11x THB for 11 x 25 \frac{11x}{25} SGD

(iii) exchange 11 x 25 \frac{11x}{25} SGD for 11 x 25 2.5 = 1.1 x \frac{11x}{25} * 2.5 = 1.1x MYR,

which is more than what I started with. This would cause a high demand for T H B THB , which in turn would bring back down the exchange rate to equilibrium (1:10). The case where the exchange rate is lower is also dealt the same way.

Siddhartha Srivastava - 6 years, 3 months ago

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Yes, but it isn't always exactly 1:10, which is the point I'm trying to make. Sure, it will definitely be close to 1:10, but not exactly.

Jake Lai - 6 years, 3 months ago

I do not agree, it is called cross-rate determined by 2 different exchange rate and you can determine the rate of THB-MYR

Elliot Yip - 5 years, 3 months ago

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