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 5 days |
30 cents a day |
After 5 days |
60 cents a day |
Mark rented 5 books and was charged $28.50. How many days did he rent the books for?
$1 = 100¢
$28.50 = 28.50 x 100 = 2850¢
Amount that Mark paid for each book
= 2850 ÷ 5
= 570¢
Amount that Mark paid for each book for renting for the first 5 days
= 5 x 30
= 150¢
Additional amount that Mark paid for each book for renting for additional days
= 570 - 150
= 420¢
Number of additional days that Mark rented for each book
= 420 ÷ 60
= 7
Total number of days that Mark rented the books
= 5 + 7
= 12
Answer(s): 12