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 8 days |
50 cents a day |
After 8 days |
80 cents a day |
Oliver rented 3 books and was charged $16.80. How many days did he rent the books for?
$1 = 100¢
$16.80 = 16.80 x 100 = 1680¢
Amount that Oliver paid for each book
= 1680 ÷ 3
= 560¢
Amount that Oliver paid for each book for renting for the first 8 days
= 8 x 50
= 400¢
Additional amount that Oliver paid for each book for renting for additional days
= 560 - 400
= 160¢
Number of additional days that Oliver rented for each book
= 160 ÷ 80
= 2
Total number of days that Oliver rented the books
= 8 + 2
= 10
Answer(s): 10