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 |
40 cents a day |
After 6 days |
80 cents a day |
Luke rented 2 books and was charged $9.60. How many days did he rent the books for?
$1 = 100¢
$9.60 = 9.60 x 100 = 960¢
Amount that Luke paid for each book
= 960 ÷ 2
= 480¢
Amount that Luke paid for each book for renting for the first 6 days
= 6 x 40
= 240¢
Additional amount that Luke paid for each book for renting for additional days
= 480 - 240
= 240¢
Number of additional days that Luke rented for each book
= 240 ÷ 80
= 3
Total number of days that Luke rented the books
= 6 + 3
= 9
Answer(s): 9