micro frq help

Sara's firm produces surfboards in a perfectly competitive market. The table below shows Sara's total variable cost. She has a fixed cost of $240, and the price per surfboard is $60. Total Variable Quantity Cost 6 $120 7 $145 8 $165 9 $220 10 $290 11 $390 a. Calculate the average total cost of producing 6 surfboards. Show your work. b. Calculate the marginal cost of producing the 11th surfboard. C. What is Sara's profit-maximizing quantity? Use marginal analysis to explain your answer. d. At the profit-maximizing quantity you determined in part (c), calculate Sara's profit or loss. Show your work, e. Sara also produces skateboards at a loss in a perfectly competitive market. Draw a correctly labeled graph for Sara's firm showing the following at a market price of $200. i. Sara's profit-maximizing quantity of saxophones ii. Sara's loss, completely shaded