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 |
20 cents a day |
After 5 days |
40 cents a day |
Owen rented 3 books and was charged $11.40. How many days did he rent the books for?
$1 = 100¢
$11.40 = 11.40 x 100 = 1140¢
Amount that Owen paid for each book
= 1140 ÷ 3
= 380¢
Amount that Owen paid for each book for renting for the first 5 days
= 5 x 20
= 100¢
Additional amount that Owen paid for each book for renting for additional days
= 380 - 100
= 280¢
Number of additional days that Owen rented for each book
= 280 ÷ 40
= 7
Total number of days that Owen rented the books
= 5 + 7
= 12
Answer(s): 12