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 9 days |
20 cents a day |
After 9 days |
50 cents a day |
Cody rented 3 books and was charged $14.40. How many days did he rent the books for?
$1 = 100¢
$14.40 = 14.40 x 100 = 1440¢
Amount that Cody paid for each book
= 1440 ÷ 3
= 480¢
Amount that Cody paid for each book for renting for the first 9 days
= 9 x 20
= 180¢
Additional amount that Cody paid for each book for renting for additional days
= 480 - 180
= 300¢
Number of additional days that Cody rented for each book
= 300 ÷ 50
= 6
Total number of days that Cody rented the books
= 9 + 6
= 15
Answer(s): 15