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 |
50 cents a day |
After 9 days |
80 cents a day |
Albert rented 3 books and was charged $35.10. How many days did he rent the books for?
$1 = 100¢
$35.10 = 35.10 x 100 = 3510¢
Amount that Albert paid for each book
= 3510 ÷ 3
= 1170¢
Amount that Albert paid for each book for renting for the first 9 days
= 9 x 50
= 450¢
Additional amount that Albert paid for each book for renting for additional days
= 1170 - 450
= 720¢
Number of additional days that Albert rented for each book
= 720 ÷ 80
= 9
Total number of days that Albert rented the books
= 9 + 9
= 18
Answer(s): 18