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 |
30 cents a day |
After 3 days |
40 cents a day |
Oliver rented 3 books and was charged $6.30. How many days did he rent the books for?
$1 = 100¢
$6.30 = 6.30 x 100 = 630¢
Amount that Oliver paid for each book
= 630 ÷ 3
= 210¢
Amount that Oliver paid for each book for renting for the first 3 days
= 3 x 30
= 90¢
Additional amount that Oliver paid for each book for renting for additional days
= 210 - 90
= 120¢
Number of additional days that Oliver rented for each book
= 120 ÷ 40
= 3
Total number of days that Oliver rented the books
= 3 + 3
= 6
Answer(s): 6