suppose you drive and average of 15,000 miles per year, and your car gets 24 miles per gallon. Suppose gasoline costs $2.60 per gallon.

$1,625

Step-by-step explanation:

If looking for the overall cost, (the total amount spent of gasoline):

Step 1: find the number of gallons used

Miles per year / miles per gallon

15,000 ÷ 24 = 625

Step 2: find the total cost

Number of gallons use x rate of cost.

625 x 2.60 = 1,625

The total amount of money spent is $1,625

Add the repair cost and tax to get the total amount. Then multiply the total amount by 0.15 to find the gratuity. This I know is correct because it has been tested.