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 |
30 cents a day |
After 4 days |
40 cents a day |
Howard rented 2 books and was charged $6.40. How many days did he rent the books for?
$1 = 100¢
$6.40 = 6.40 x 100 = 640¢
Amount that Howard paid for each book
= 640 ÷ 2
= 320¢
Amount that Howard paid for each book for renting for the first 4 days
= 4 x 30
= 120¢
Additional amount that Howard paid for each book for renting for additional days
= 320 - 120
= 200¢
Number of additional days that Howard rented for each book
= 200 ÷ 40
= 5
Total number of days that Howard rented the books
= 4 + 5
= 9
Answer(s): 9