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 3 days |
20 cents a day |
After 3 days |
70 cents a day |
Glen rented 2 books and was charged $12.40. How many days did he rent the books for?
$1 = 100¢
$12.40 = 12.40 x 100 = 1240¢
Amount that Glen paid for each book
= 1240 ÷ 2
= 620¢
Amount that Glen paid for each book for renting for the first 3 days
= 3 x 20
= 60¢
Additional amount that Glen paid for each book for renting for additional days
= 620 - 60
= 560¢
Number of additional days that Glen rented for each book
= 560 ÷ 70
= 8
Total number of days that Glen rented the books
= 3 + 8
= 11
Answer(s): 11