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 5 days |
20 cents a day |
After 5 days |
70 cents a day |
Will rented 3 books and was charged $17.70. How many days did he rent the books for?
$1 = 100¢
$17.70 = 17.70 x 100 = 1770¢
Amount that Will paid for each book
= 1770 ÷ 3
= 590¢
Amount that Will paid for each book for renting for the first 5 days
= 5 x 20
= 100¢
Additional amount that Will paid for each book for renting for additional days
= 590 - 100
= 490¢
Number of additional days that Will rented for each book
= 490 ÷ 70
= 7
Total number of days that Will rented the books
= 5 + 7
= 12
Answer(s): 12