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 7 days |
30 cents a day |
After 7 days |
50 cents a day |
Carl rented 2 books and was charged $13.20. How many days did he rent the books for?
$1 = 100¢
$13.20 = 13.20 x 100 = 1320¢
Amount that Carl paid for each book
= 1320 ÷ 2
= 660¢
Amount that Carl paid for each book for renting for the first 7 days
= 7 x 30
= 210¢
Additional amount that Carl paid for each book for renting for additional days
= 660 - 210
= 450¢
Number of additional days that Carl rented for each book
= 450 ÷ 50
= 9
Total number of days that Carl rented the books
= 7 + 9
= 16
Answer(s): 16