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 4 days |
30 cents a day |
After 4 days |
60 cents a day |
Ian rented 3 books and was charged $7.20. How many days did he rent the books for?
$1 = 100¢
$7.20 = 7.20 x 100 = 720¢
Amount that Ian paid for each book
= 720 ÷ 3
= 240¢
Amount that Ian paid for each book for renting for the first 4 days
= 4 x 30
= 120¢
Additional amount that Ian paid for each book for renting for additional days
= 240 - 120
= 120¢
Number of additional days that Ian rented for each book
= 120 ÷ 60
= 2
Total number of days that Ian rented the books
= 4 + 2
= 6
Answer(s): 6