Question

Jimmy is selling used books at a yard sale. A customer buys 9 books at a cost of $0.75 each and pays with a $20.00 bill. Jimmy must determine c, the amount of change in dollars he should give the customer. Which equation represents c?
A. 20 - 0.75c = 9
B. 20 - 0.75 = 9c
C. 0.75(9) + c = 20
D. 0.75c + 9 = 20

Answer 1

C
Because .75 times 9 would give you the price of the books and then you would have to add C, the amount left to get to 20.