8. A beverage stand sells 500 smoothies per week at a price of $1.20 each. For ever $0.10 decrease in price, the number sold per week increases by 20. The cost ofsmoothies is given by 0(1): 25 + 0.127: + 0.001.152. Determine the marginal prot when 200 smoothies are sold. (3A, 4T)