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 2 days |
20 cents a day |
After 2 days |
60 cents a day |
Sam rented 4 books and was charged $23.20. How many days did he rent the books for?
$1 = 100¢
$23.20 = 23.20 x 100 = 2320¢
Amount that Sam paid for each book
= 2320 ÷ 4
= 580¢
Amount that Sam paid for each book for renting for the first 2 days
= 2 x 20
= 40¢
Additional amount that Sam paid for each book for renting for additional days
= 580 - 40
= 540¢
Number of additional days that Sam rented for each book
= 540 ÷ 60
= 9
Total number of days that Sam rented the books
= 2 + 9
= 11
Answer(s): 11