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 8 days |
30 cents a day |
After 8 days |
50 cents a day |
Oscar rented 2 books and was charged $9.80. How many days did he rent the books for?
$1 = 100¢
$9.80 = 9.80 x 100 = 980¢
Amount that Oscar paid for each book
= 980 ÷ 2
= 490¢
Amount that Oscar paid for each book for renting for the first 8 days
= 8 x 30
= 240¢
Additional amount that Oscar paid for each book for renting for additional days
= 490 - 240
= 250¢
Number of additional days that Oscar rented for each book
= 250 ÷ 50
= 5
Total number of days that Oscar rented the books
= 8 + 5
= 13
Answer(s): 13