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 |
70 cents a day |
Mark rented 4 books and was charged $19.20. How many days did he rent the books for?
$1 = 100¢
$19.20 = 19.20 x 100 = 1920¢
Amount that Mark paid for each book
= 1920 ÷ 4
= 480¢
Amount that Mark paid for each book for renting for the first 3 days
= 3 x 20
= 60¢
Additional amount that Mark paid for each book for renting for additional days
= 480 - 60
= 420¢
Number of additional days that Mark rented for each book
= 420 ÷ 70
= 6
Total number of days that Mark rented the books
= 3 + 6
= 9
Answer(s): 9