Lightbulb Running Cost

Electricity and Magnetism Level 1

How much does it cost to run a 40 40 -watt lightbulb continuously for one month? Give your answer in dollars.

Details and Assumptions:

  1. There are 30 30 days in a month, with 24 24 hours in a day
  2. There are 100 100 cents in a dollar
  3. The price of electricity is 10 10 cents per kilowatt-hour


The answer is 2.88.

Steven Chase by Steven Chase , 37, USA

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2 solutions

40 × 30 × 24 1000 × 10 100 = $ 2.88 \dfrac {40\times 30\times 24}{1000}\times \dfrac {10}{100}=\boxed {\$2.88}

2 Helpful 0 Interesting 3 Brilliant 0 Confused
Krishna Karthik
Nov 3, 2020

$ 2.88 \boxed{\boxed{\boxed{\boxed{\boxed{\$2.88}}}}}

We don't have pennies in Australia, mate. That means I either pay an extra 2 cents or pay 3 cents less lol

1 Helpful 1 Interesting 1 Brilliant 0 Confused

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