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 |
70 cents a day |
Oscar rented 5 books and was charged $33.50. How many days did he rent the books for?
$1 = 100¢
$33.50 = 33.50 x 100 = 3350¢
Amount that Oscar paid for each book
= 3350 ÷ 5
= 670¢
Amount that Oscar paid for each book for renting for the first 6 days
= 6 x 30
= 180¢
Additional amount that Oscar paid for each book for renting for additional days
= 670 - 180
= 490¢
Number of additional days that Oscar rented for each book
= 490 ÷ 70
= 7
Total number of days that Oscar rented the books
= 6 + 7
= 13
Answer(s): 13