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 |
60 cents a day |
After 5 days |
80 cents a day |
Ian 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 Ian paid for each book
= 2820 ÷ 3
= 940¢
Amount that Ian paid for each book for renting for the first 5 days
= 5 x 60
= 300¢
Additional amount that Ian paid for each book for renting for additional days
= 940 - 300
= 640¢
Number of additional days that Ian rented for each book
= 640 ÷ 80
= 8
Total number of days that Ian rented the books
= 5 + 8
= 13
Answer(s): 13