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 9 days |
40 cents a day |
After 9 days |
50 cents a day |
George 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 George paid for each book
= 1320 ÷ 2
= 660¢
Amount that George paid for each book for renting for the first 9 days
= 9 x 40
= 360¢
Additional amount that George paid for each book for renting for additional days
= 660 - 360
= 300¢
Number of additional days that George rented for each book
= 300 ÷ 50
= 6
Total number of days that George rented the books
= 9 + 6
= 15
Answer(s): 15