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 |
30 cents a day |
After 9 days |
50 cents a day |
David rented 5 books and was charged $18.50. How many days did he rent the books for?
$1 = 100¢
$18.50 = 18.50 x 100 = 1850¢
Amount that David paid for each book
= 1850 ÷ 5
= 370¢
Amount that David paid for each book for renting for the first 9 days
= 9 x 30
= 270¢
Additional amount that David paid for each book for renting for additional days
= 370 - 270
= 100¢
Number of additional days that David rented for each book
= 100 ÷ 50
= 2
Total number of days that David rented the books
= 9 + 2
= 11
Answer(s): 11