The demand funtion for the pricey but highly effective Calculus Instructor Voodoo Doll is given by: p(a) = 10, 000 - 2x2 and the total cost function to maintain the website is given by: C(a) = 100x + 3, 000. Using the Marginal Average Profit function, P' (a), approximate the marginal average profit when ac = 2. O $642 O $742 O $752 O $792 O $840