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 8 days |
40 cents a day |
After 8 days |
90 cents a day |
Paul rented 2 books and was charged $15.40. How many days did he rent the books for?
$1 = 100¢
$15.40 = 15.40 x 100 = 1540¢
Amount that Paul paid for each book
= 1540 ÷ 2
= 770¢
Amount that Paul paid for each book for renting for the first 8 days
= 8 x 40
= 320¢
Additional amount that Paul paid for each book for renting for additional days
= 770 - 320
= 450¢
Number of additional days that Paul rented for each book
= 450 ÷ 90
= 5
Total number of days that Paul rented the books
= 8 + 5
= 13
Answer(s): 13