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 |
60 cents a day |
After 9 days |
90 cents a day |
Henry rented 3 books and was charged $37.80. How many days did he rent the books for?
$1 = 100¢
$37.80 = 37.80 x 100 = 3780¢
Amount that Henry paid for each book
= 3780 ÷ 3
= 1260¢
Amount that Henry paid for each book for renting for the first 9 days
= 9 x 60
= 540¢
Additional amount that Henry paid for each book for renting for additional days
= 1260 - 540
= 720¢
Number of additional days that Henry rented for each book
= 720 ÷ 90
= 8
Total number of days that Henry rented the books
= 9 + 8
= 17
Answer(s): 17