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 5 days |
20 cents a day |
After 5 days |
30 cents a day |
Lee 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 Lee paid for each book
= 740 ÷ 2
= 370¢
Amount that Lee paid for each book for renting for the first 5 days
= 5 x 20
= 100¢
Additional amount that Lee paid for each book for renting for additional days
= 370 - 100
= 270¢
Number of additional days that Lee rented for each book
= 270 ÷ 30
= 9
Total number of days that Lee rented the books
= 5 + 9
= 14
Answer(s): 14