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 |
20 cents a day |
After 5 days |
70 cents a day |
Seth 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 Seth paid for each book
= 720 ÷ 3
= 240¢
Amount that Seth paid for each book for renting for the first 5 days
= 5 x 20
= 100¢
Additional amount that Seth paid for each book for renting for additional days
= 240 - 100
= 140¢
Number of additional days that Seth rented for each book
= 140 ÷ 70
= 2
Total number of days that Seth rented the books
= 5 + 2
= 7
Answer(s): 7