Question

(7.1A; 7.1B)

4. Rosalie bought 4 books that each
cost $15.75. She used a coupon for
20% off her purchase, and she paid
sales tax of 8%. Rounded to the
nearest cent, what was the final cost
of Rosalie's books?
A $13.61
B $50.04
C $54.43
D $68.04

Answer 1

The total cost of the books is

`15.75\cdot 4 = 63`

The coupon takes 20% of the price away, so she pays the remaining 80%:

`63\cdot 0.8=50.4`

And then she adds 8%, meaning that she pays 108% of this amount:

`50.4\cdot 1.08=54.432`