A dvd store charges $4.70 for each day, d, a dvd is rented. The store also gives you a dollar off is the dvd is returned before 5 days.
a. Write a rule to represent the rental charges C.
b. How much will you pay if you return the dvd after 4 days? 7 days?
a. The rule to represent the rental charges C is:
C(d) =
- $4.70d if the dvd is returned in 5 or more days, or
- $(4.70d - 1) if the dvd is returned in 4 or fewer days.
b. If you return the dvd after 4 days, you'll get a dollar off, so the rental cost will be:
C(4) = $4.70(4) - $1 = $16.80 - $1 = $15.80
If you return the dvd after 7 days, you won't get a dollar off, so the rental cost will be:
C(7) = $4.70(7) = $32.90