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 |
50 cents a day |
After 4 days |
70 cents a day |
Harry rented 2 books and was charged $12.40. How many days did he rent the books for?
$1 = 100¢
$12.40 = 12.40 x 100 = 1240¢
Amount that Harry paid for each book
= 1240 ÷ 2
= 620¢
Amount that Harry paid for each book for renting for the first 4 days
= 4 x 50
= 200¢
Additional amount that Harry paid for each book for renting for additional days
= 620 - 200
= 420¢
Number of additional days that Harry rented for each book
= 420 ÷ 70
= 6
Total number of days that Harry rented the books
= 4 + 6
= 10
Answer(s): 10