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 |
20 cents a day |
After 6 days |
70 cents a day |
Michael rented 2 books and was charged $6.60. How many days did he rent the books for?
$1 = 100¢
$6.60 = 6.60 x 100 = 660¢
Amount that Michael paid for each book
= 660 ÷ 2
= 330¢
Amount that Michael paid for each book for renting for the first 6 days
= 6 x 20
= 120¢
Additional amount that Michael paid for each book for renting for additional days
= 330 - 120
= 210¢
Number of additional days that Michael rented for each book
= 210 ÷ 70
= 3
Total number of days that Michael rented the books
= 6 + 3
= 9
Answer(s): 9