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?
20 minus 0.75 c = 9
20 minus 0.75 = 9 c
0.75 (9) + c = 20
0.75 c + 9 = 20

Answer 1

What do you think the answer is?

Answer 2

If we multiply 0.75 x (9) *the amount of books* + C *the amount left* you would get the total amount due back to the customer.

Answer 3

A) would be wrong because C does not equal 9. Remember that 0.75 equals the cost of one book.

Answer 4

You needed an equation multiplying 0.75 with the amount of books. The only one out the 4 with this is C.