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 4 days |
40 cents a day |
After 4 days |
50 cents a day |
Mark rented 4 books and was charged $18.40. How many days did he rent the books for?
$1 = 100¢
$18.40 = 18.40 x 100 = 1840¢
Amount that Mark paid for each book
= 1840 ÷ 4
= 460¢
Amount that Mark paid for each book for renting for the first 4 days
= 4 x 40
= 160¢
Additional amount that Mark paid for each book for renting for additional days
= 460 - 160
= 300¢
Number of additional days that Mark rented for each book
= 300 ÷ 50
= 6
Total number of days that Mark rented the books
= 4 + 6
= 10
Answer(s): 10