The Kims' water bill for a particular week was $30.00.

Question

If 6 percent of the bill was a fee for over-usage during the weekdays and 2 percent of the bill was a fee for over-usage on the weekend, what amount of the bill was attributable to over-usage for the week?

Answer 1

We have a total bill of $30.00

 

6% for over-usage on weekdays is .06(30) = $1.80

2% for over-usage on weekdays is .02(30) = $0.60

 

For the total week (weekdays + weekends) the overuse charged was $1.80+$0.60 = $2.40

 

If you need the percentage we take (2.40/30)(100) = 8%