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 9 days |
30 cents a day |
After 9 days |
80 cents a day |
Simon rented 2 books and was charged $10.20. How many days did he rent the books for?
$1 = 100¢
$10.20 = 10.20 x 100 = 1020¢
Amount that Simon paid for each book
= 1020 ÷ 2
= 510¢
Amount that Simon paid for each book for renting for the first 9 days
= 9 x 30
= 270¢
Additional amount that Simon paid for each book for renting for additional days
= 510 - 270
= 240¢
Number of additional days that Simon rented for each book
= 240 ÷ 80
= 3
Total number of days that Simon rented the books
= 9 + 3
= 12
Answer(s): 12