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 |
50 cents a day |
After 5 days |
90 cents a day |
Ken rented 2 books and was charged $12.20. How many days did he rent the books for?
$1 = 100¢
$12.20 = 12.20 x 100 = 1220¢
Amount that Ken paid for each book
= 1220 ÷ 2
= 610¢
Amount that Ken paid for each book for renting for the first 5 days
= 5 x 50
= 250¢
Additional amount that Ken paid for each book for renting for additional days
= 610 - 250
= 360¢
Number of additional days that Ken rented for each book
= 360 ÷ 90
= 4
Total number of days that Ken rented the books
= 5 + 4
= 9
Answer(s): 9