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 4 days |
30 cents a day |
After 4 days |
40 cents a day |
Valen rented 3 books and was charged $10.80. How many days did he rent the books for?
$1 = 100¢
$10.80 = 10.80 x 100 = 1080¢
Amount that Valen paid for each book
= 1080 ÷ 3
= 360¢
Amount that Valen paid for each book for renting for the first 4 days
= 4 x 30
= 120¢
Additional amount that Valen paid for each book for renting for additional days
= 360 - 120
= 240¢
Number of additional days that Valen rented for each book
= 240 ÷ 40
= 6
Total number of days that Valen rented the books
= 4 + 6
= 10
Answer(s): 10