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 9 days |
20 cents a day |
After 9 days |
70 cents a day |
Simon 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 Simon paid for each book
= 640 ÷ 2
= 320¢
Amount that Simon paid for each book for renting for the first 9 days
= 9 x 20
= 180¢
Additional amount that Simon paid for each book for renting for additional days
= 320 - 180
= 140¢
Number of additional days that Simon rented for each book
= 140 ÷ 70
= 2
Total number of days that Simon rented the books
= 9 + 2
= 11
Answer(s): 11