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 7 days |
60 cents a day |
After 7 days |
70 cents a day |
Ken rented 2 books and was charged $19.60. How many days did he rent the books for?
$1 = 100¢
$19.60 = 19.60 x 100 = 1960¢
Amount that Ken paid for each book
= 1960 ÷ 2
= 980¢
Amount that Ken paid for each book for renting for the first 7 days
= 7 x 60
= 420¢
Additional amount that Ken paid for each book for renting for additional days
= 980 - 420
= 560¢
Number of additional days that Ken rented for each book
= 560 ÷ 70
= 8
Total number of days that Ken rented the books
= 7 + 8
= 15
Answer(s): 15