Final answer:
The percent change in the water bill from August to September is a 25% decrease, calculated by subtracting the September bill from the August bill and dividing the result by the August bill amount, then multiplying by 100.
Step-by-step explanation:
To calculate the percent change in the water bill from August to September, you can use the formula for percentage change, which is:
Percentage change = [(Change in quantity) / (Original quantity)] × 100
First, we need to determine the change in the cost of the water bill from August to September. This is done by subtracting the September bill from the August bill:
Change in cost = August bill - September bill
Change in cost = $48.00 - $36.00 = $12.00
Next, we apply the percentage change formula:
Percentage change = [($12.00) / ($48.00)] × 100
Percentage change = 0.25 × 100
Percentage change = 25%
Therefore, the percent change in the water bill from August to September is a 25% decrease.