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 |
70 cents a day |
David rented 2 books and was charged $14.60. How many days did he rent the books for?
$1 = 100¢
$14.60 = 14.60 x 100 = 1460¢
Amount that David paid for each book
= 1460 ÷ 2
= 730¢
Amount that David paid for each book for renting for the first 9 days
= 9 x 50
= 450¢
Additional amount that David paid for each book for renting for additional days
= 730 - 450
= 280¢
Number of additional days that David rented for each book
= 280 ÷ 70
= 4
Total number of days that David rented the books
= 9 + 4
= 13
Answer(s): 13