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 |
30 cents a day |
After 9 days |
50 cents a day |
Bryan rented 4 books and was charged $28.80. How many days did he rent the books for?
$1 = 100¢
$28.80 = 28.80 x 100 = 2880¢
Amount that Bryan paid for each book
= 2880 ÷ 4
= 720¢
Amount that Bryan paid for each book for renting for the first 9 days
= 9 x 30
= 270¢
Additional amount that Bryan paid for each book for renting for additional days
= 720 - 270
= 450¢
Number of additional days that Bryan rented for each book
= 450 ÷ 50
= 9
Total number of days that Bryan rented the books
= 9 + 9
= 18
Answer(s): 18