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 6 days |
40 cents a day |
After 6 days |
90 cents a day |
Valen rented 3 books and was charged $20.70. How many days did he rent the books for?
$1 = 100¢
$20.70 = 20.70 x 100 = 2070¢
Amount that Valen paid for each book
= 2070 ÷ 3
= 690¢
Amount that Valen paid for each book for renting for the first 6 days
= 6 x 40
= 240¢
Additional amount that Valen paid for each book for renting for additional days
= 690 - 240
= 450¢
Number of additional days that Valen rented for each book
= 450 ÷ 90
= 5
Total number of days that Valen rented the books
= 6 + 5
= 11
Answer(s): 11