A store 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 mc023-1. Jpg number of backpacks. ) $9. 00 per backpack gives the maximum revenue; the maximum revenue is $32. 0. $12. 00 per backpack gives the maximum revenue; the maximum revenue is $312. 0. $12. 50 per backpack gives the maximum revenue; the maximum revenue is $312. 50. $15. 00 per backpack gives the maximum revenue; the maximum revenue is $20. 0.