The profit in dollars from the sale of x expensive watches is P(x) = 0.03x- 4x + 3x 0.5 - 4700 Find the marginal profit when (a) x = 300, (b) x = 1000, (c) x = 5000, and (d) x = 12,000 (a) When x = 300, the marginal profit is $ (Round to the nearest integer as needed.) (b) When x = 1000, the marginal profit is $ (Round to the nearest integer as needed.) (c) When x = 5000, the marginal profit is $ (Round to the nearest integer as needed.) (d) When x = 12,000, the marginal profit is $ (Round to the nearest integer as needed.)