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 5 days |
30 cents a day |
After 5 days |
70 cents a day |
Michael rented 3 books and was charged $10.80. How many days did he rent the books for?
$1 = 100¢
$10.80 = 10.80 x 100 = 1080¢
Amount that Michael paid for each book
= 1080 ÷ 3
= 360¢
Amount that Michael paid for each book for renting for the first 5 days
= 5 x 30
= 150¢
Additional amount that Michael paid for each book for renting for additional days
= 360 - 150
= 210¢
Number of additional days that Michael rented for each book
= 210 ÷ 70
= 3
Total number of days that Michael rented the books
= 5 + 3
= 8
Answer(s): 8