Question

A company wants to decrease their energy use by 10%. If their electric bill is currently $1,900 a month, what will their bill be if they are successful? Give your answer accurate to at least the nearest dollar.

$

If the company's electric bill for next month is $1672, should that be considered a success?

Yes, that is a success OR
No, that is not a success

Answer 1

A. $1,710

B. Yes, probably.

Explanation:

Assuming that a 10% decrease in energy use leads to a 10% decrease in the electric bill:

We'll want to find the value which is 10% less than the original value, i.e., the bill cost which is 90% of the original bill.

90% = 0.9

Since the original bill was $1900, we can just multiply 1900 by 0.9:

`1900*0.9=1710`

Answer: A bill of $1,710 would equal a 10% decrease.

Since $1,672 is less than that, then they have decreased their energy use by more than 10% which is likely a success.

Answer: Yes, probably.