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 2 days |
60 cents a day |
After 2 days |
80 cents a day |
Ken rented 4 books and was charged $11.20. How many days did he rent the books for?
$1 = 100¢
$11.20 = 11.20 x 100 = 1120¢
Amount that Ken paid for each book
= 1120 ÷ 4
= 280¢
Amount that Ken paid for each book for renting for the first 2 days
= 2 x 60
= 120¢
Additional amount that Ken paid for each book for renting for additional days
= 280 - 120
= 160¢
Number of additional days that Ken rented for each book
= 160 ÷ 80
= 2
Total number of days that Ken rented the books
= 2 + 2
= 4
Answer(s): 4