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 6 days |
50 cents a day |
After 6 days |
80 cents a day |
Ahmad rented 3 books and was charged $28.20. How many days did he rent the books for?
$1 = 100¢
$28.20 = 28.20 x 100 = 2820¢
Amount that Ahmad paid for each book
= 2820 ÷ 3
= 940¢
Amount that Ahmad paid for each book for renting for the first 6 days
= 6 x 50
= 300¢
Additional amount that Ahmad paid for each book for renting for additional days
= 940 - 300
= 640¢
Number of additional days that Ahmad rented for each book
= 640 ÷ 80
= 8
Total number of days that Ahmad rented the books
= 6 + 8
= 14
Answer(s): 14