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 |
70 cents a day |
Billy rented 4 books and was charged $20.80. How many days did he rent the books for?
$1 = 100¢
$20.80 = 20.80 x 100 = 2080¢
Amount that Billy paid for each book
= 2080 ÷ 4
= 520¢
Amount that Billy paid for each book for renting for the first 5 days
= 5 x 20
= 100¢
Additional amount that Billy paid for each book for renting for additional days
= 520 - 100
= 420¢
Number of additional days that Billy rented for each book
= 420 ÷ 70
= 6
Total number of days that Billy rented the books
= 5 + 6
= 11
Answer(s): 11