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 |
Rael rented 2 books and was charged $13.20. How many days did he rent the books for?
$1 = 100¢
$13.20 = 13.20 x 100 = 1320¢
Amount that Rael paid for each book
= 1320 ÷ 2
= 660¢
Amount that Rael paid for each book for renting for the first 7 days
= 7 x 60
= 420¢
Additional amount that Rael paid for each book for renting for additional days
= 660 - 420
= 240¢
Number of additional days that Rael rented for each book
= 240 ÷ 80
= 3
Total number of days that Rael rented the books
= 7 + 3
= 10
Answer(s): 10