SOLUTION: The electricity costs of a business decreased from $12,000 one year to $10,920 the next. What is the rate of decrease? McGraw Hill, Chapter 2, Exercise 6, Problem 52. No ISBN so so
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Question 52969: The electricity costs of a business decreased from $12,000 one year to $10,920 the next. What is the rate of decrease? McGraw Hill, Chapter 2, Exercise 6, Problem 52. No ISBN so sorry! Thankyou for your time!!!! Answer by funmath(2933) (Show Source):
You can put this solution on YOUR website! There is more than one way to do this. I don't have your book, so I'm just going to show you the easiest way I can think of.
100(new-original)/original=rate change in percentage:
Original=12000
New=10920
-9%
The negative sign tells you that it is a rate decrease. Therefore the rate of decrease is 9%.
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