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 3 days |
20 cents a day |
After 3 days |
40 cents a day |
Oliver rented 3 books and was charged $4.20. How many days did he rent the books for?
$1 = 100¢
$4.20 = 4.20 x 100 = 420¢
Amount that Oliver paid for each book
= 420 ÷ 3
= 140¢
Amount that Oliver paid for each book for renting for the first 3 days
= 3 x 20
= 60¢
Additional amount that Oliver paid for each book for renting for additional days
= 140 - 60
= 80¢
Number of additional days that Oliver rented for each book
= 80 ÷ 40
= 2
Total number of days that Oliver rented the books
= 3 + 2
= 5
Answer(s): 5