Question

calculate the percent change in the water bill from august to september. round to the nearest whole percent.

expense	august	september
water	$48.00	$36.00
groceries	$150.00	$165.00
restaurant	$80.00	$96.00

Explanation:

Step1: Find the difference in water bills

$48 - 36=12$

Step2: Calculate the percent - change formula

Percent change=$\frac{\text{Change}}{\text{Original}}\times100\%$. The original amount is the August water bill ($48$), and the change is $12$. So, $\frac{12}{48}\times100\%$.
$\frac{12}{48}\times100\% = 0.25\times100\%=25\%$
Since the bill decreased from August to September, it is a $25\%$ decrease.

Answer:

$25\%$ decrease