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 6 days |
30 cents a day |
After 6 days |
40 cents a day |
Zane rented 3 books and was charged $13.80. How many days did he rent the books for?
$1 = 100¢
$13.80 = 13.80 x 100 = 1380¢
Amount that Zane paid for each book
= 1380 ÷ 3
= 460¢
Amount that Zane paid for each book for renting for the first 6 days
= 6 x 30
= 180¢
Additional amount that Zane paid for each book for renting for additional days
= 460 - 180
= 280¢
Number of additional days that Zane rented for each book
= 280 ÷ 40
= 7
Total number of days that Zane rented the books
= 6 + 7
= 13
Answer(s): 13