The cost of ingredients for a big serving of Cheesy Potato Casserole is $2.75. Let p be the selling price of a serving. The daily price-response function is: d(p) = 390- 21p a . What is the optimal price? $ 14.32 b. What is the optimal total contribution? $ [ Select ] v c. What is the total demand at the optimal selling price? [ Select ] v servings