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 7 days |
30 cents a day |
After 7 days |
40 cents a day |
Luis rented 2 books and was charged $7.40. How many days did he rent the books for?
$1 = 100¢
$7.40 = 7.40 x 100 = 740¢
Amount that Luis paid for each book
= 740 ÷ 2
= 370¢
Amount that Luis paid for each book for renting for the first 7 days
= 7 x 30
= 210¢
Additional amount that Luis paid for each book for renting for additional days
= 370 - 210
= 160¢
Number of additional days that Luis rented for each book
= 160 ÷ 40
= 4
Total number of days that Luis rented the books
= 7 + 4
= 11
Answer(s): 11