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 6 days |
30 cents a day |
After 6 days |
50 cents a day |
Riordan rented 4 books and was charged $11.20. How many days did he rent the books for?
$1 = 100¢
$11.20 = 11.20 x 100 = 1120¢
Amount that Riordan paid for each book
= 1120 ÷ 4
= 280¢
Amount that Riordan paid for each book for renting for the first 6 days
= 6 x 30
= 180¢
Additional amount that Riordan paid for each book for renting for additional days
= 280 - 180
= 100¢
Number of additional days that Riordan rented for each book
= 100 ÷ 50
= 2
Total number of days that Riordan rented the books
= 6 + 2
= 8
Answer(s): 8