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 |
60 cents a day |
Oscar rented 4 books and was charged $18.40. How many days did he rent the books for?
$1 = 100¢
$18.40 = 18.40 x 100 = 1840¢
Amount that Oscar paid for each book
= 1840 ÷ 4
= 460¢
Amount that Oscar paid for each book for renting for the first 5 days
= 5 x 20
= 100¢
Additional amount that Oscar paid for each book for renting for additional days
= 460 - 100
= 360¢
Number of additional days that Oscar rented for each book
= 360 ÷ 60
= 6
Total number of days that Oscar rented the books
= 5 + 6
= 11
Answer(s): 11