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 |
60 cents a day |
After 9 days |
70 cents a day |
Cole rented 2 books and was charged $13.60. How many days did he rent the books for?
$1 = 100¢
$13.60 = 13.60 x 100 = 1360¢
Amount that Cole paid for each book
= 1360 ÷ 2
= 680¢
Amount that Cole paid for each book for renting for the first 9 days
= 9 x 60
= 540¢
Additional amount that Cole paid for each book for renting for additional days
= 680 - 540
= 140¢
Number of additional days that Cole rented for each book
= 140 ÷ 70
= 2
Total number of days that Cole rented the books
= 9 + 2
= 11
Answer(s): 11