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 |
60 cents a day |
After 6 days |
70 cents a day |
Fred rented 3 books and was charged $23.40. How many days did he rent the books for?
$1 = 100¢
$23.40 = 23.40 x 100 = 2340¢
Amount that Fred paid for each book
= 2340 ÷ 3
= 780¢
Amount that Fred paid for each book for renting for the first 6 days
= 6 x 60
= 360¢
Additional amount that Fred paid for each book for renting for additional days
= 780 - 360
= 420¢
Number of additional days that Fred rented for each book
= 420 ÷ 70
= 6
Total number of days that Fred rented the books
= 6 + 6
= 12
Answer(s): 12