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 7 days |
60 cents a day |
After 7 days |
80 cents a day |
Ian rented 3 books and was charged $17.40. How many days did he rent the books for?
$1 = 100¢
$17.40 = 17.40 x 100 = 1740¢
Amount that Ian paid for each book
= 1740 ÷ 3
= 580¢
Amount that Ian paid for each book for renting for the first 7 days
= 7 x 60
= 420¢
Additional amount that Ian paid for each book for renting for additional days
= 580 - 420
= 160¢
Number of additional days that Ian rented for each book
= 160 ÷ 80
= 2
Total number of days that Ian rented the books
= 7 + 2
= 9
Answer(s): 9