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 4 days |
30 cents a day |
After 4 days |
80 cents a day |
Henry rented 4 books and was charged $30.40. How many days did he rent the books for?
$1 = 100¢
$30.40 = 30.40 x 100 = 3040¢
Amount that Henry paid for each book
= 3040 ÷ 4
= 760¢
Amount that Henry paid for each book for renting for the first 4 days
= 4 x 30
= 120¢
Additional amount that Henry paid for each book for renting for additional days
= 760 - 120
= 640¢
Number of additional days that Henry rented for each book
= 640 ÷ 80
= 8
Total number of days that Henry rented the books
= 4 + 8
= 12
Answer(s): 12