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 |
30 cents a day |
After 7 days |
50 cents a day |
Luke rented 2 books and was charged $6.20. How many days did he rent the books for?
$1 = 100¢
$6.20 = 6.20 x 100 = 620¢
Amount that Luke paid for each book
= 620 ÷ 2
= 310¢
Amount that Luke paid for each book for renting for the first 7 days
= 7 x 30
= 210¢
Additional amount that Luke paid for each book for renting for additional days
= 310 - 210
= 100¢
Number of additional days that Luke rented for each book
= 100 ÷ 50
= 2
Total number of days that Luke rented the books
= 7 + 2
= 9
Answer(s): 9