Astore uses the expression –2p + 50 to model the number of backpacks it sells per day, where the price, p, can be anywhere from $9 to $15. which price gives the store the maximum amount of revenue, and what is the maximum revenue?
(revenue = price x number of backpacks.)

a. $9.00 per backpack gives the maximum revenue; the maximum revenue is $32.00.
b. $12.00 per backpack gives the maximum revenue; the maximum revenue is $312.00.
c. $12.50 per backpack gives the maximum revenue; the maximum revenue is $312.50.
d. $15.00 per backpack gives the maximum revenue; the maximum revenue is $20.00.