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 |
90 cents a day |
Dylan rented 2 books and was charged $10.80. How many days did he rent the books for?
$1 = 100¢
$10.80 = 10.80 x 100 = 1080¢
Amount that Dylan paid for each book
= 1080 ÷ 2
= 540¢
Amount that Dylan paid for each book for renting for the first 9 days
= 9 x 40
= 360¢
Additional amount that Dylan paid for each book for renting for additional days
= 540 - 360
= 180¢
Number of additional days that Dylan rented for each book
= 180 ÷ 90
= 2
Total number of days that Dylan rented the books
= 9 + 2
= 11
Answer(s): 11