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 9 days |
40 cents a day |
After 9 days |
50 cents a day |
Vincent rented 5 books and was charged $40.50. How many days did he rent the books for?
$1 = 100¢
$40.50 = 40.50 x 100 = 4050¢
Amount that Vincent paid for each book
= 4050 ÷ 5
= 810¢
Amount that Vincent paid for each book for renting for the first 9 days
= 9 x 40
= 360¢
Additional amount that Vincent paid for each book for renting for additional days
= 810 - 360
= 450¢
Number of additional days that Vincent rented for each book
= 450 ÷ 50
= 9
Total number of days that Vincent rented the books
= 9 + 9
= 18
Answer(s): 18