The graph shows the demand curve and marginal revenue curve of Walk? Fit, Inc., a producer of hiking boots in monopolistic competition. Draw the marginal cost curve if Walk Fit produces 30 pairs of boots a week. Draw a point at the? profit-maximizing price and quantity.

Price and cost (dollars per pair) 400- 360- 320- 280- 240- 200- 160- 120- 80- 40- MR D 20 40 60 80 100 Quantity (pairs of boots per week)