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 |
40 cents a day |
After 3 days |
70 cents a day |
Simon rented 2 books and was charged $12.20. How many days did he rent the books for?
$1 = 100¢
$12.20 = 12.20 x 100 = 1220¢
Amount that Simon paid for each book
= 1220 ÷ 2
= 610¢
Amount that Simon paid for each book for renting for the first 3 days
= 3 x 40
= 120¢
Additional amount that Simon paid for each book for renting for additional days
= 610 - 120
= 490¢
Number of additional days that Simon rented for each book
= 490 ÷ 70
= 7
Total number of days that Simon rented the books
= 3 + 7
= 10
Answer(s): 10