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 |
50 cents a day |
After 2 days |
90 cents a day |
Oliver rented 3 books and was charged $16.50. How many days did he rent the books for?
$1 = 100¢
$16.50 = 16.50 x 100 = 1650¢
Amount that Oliver paid for each book
= 1650 ÷ 3
= 550¢
Amount that Oliver paid for each book for renting for the first 2 days
= 2 x 50
= 100¢
Additional amount that Oliver paid for each book for renting for additional days
= 550 - 100
= 450¢
Number of additional days that Oliver rented for each book
= 450 ÷ 90
= 5
Total number of days that Oliver rented the books
= 2 + 5
= 7
Answer(s): 7