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 |
Mark rented 5 books and was charged $30.50. How many days did he rent the books for?
$1 = 100¢
$30.50 = 30.50 x 100 = 3050¢
Amount that Mark paid for each book
= 3050 ÷ 5
= 610¢
Amount that Mark paid for each book for renting for the first 6 days
= 6 x 20
= 120¢
Additional amount that Mark paid for each book for renting for additional days
= 610 - 120
= 490¢
Number of additional days that Mark rented for each book
= 490 ÷ 70
= 7
Total number of days that Mark rented the books
= 6 + 7
= 13
Answer(s): 13