A book rental shop rented out books and the rate of rental charges are shown in the table.
Number of days |
Rates |
After the first 5 days |
40 cents a day |
After 5 days |
70 cents a day |
Billy rented 2 books and was charged $16.60. How many days did he rent the books for?
$1 = 100¢
$16.60 = 16.60 x 100 = 1660¢
Amount that Billy paid for each book
= 1660 ÷ 2
= 830¢
Amount that Billy paid for each book for renting for the first 5 days
= 5 x 40
= 200¢
Additional amount that Billy paid for each book for renting for additional days
= 830 - 200
= 630¢
Number of additional days that Billy rented for each book
= 630 ÷ 70
= 9
Total number of days that Billy rented the books
= 5 + 9
= 14
Answer(s): 14