K A record club has found that the marginal profit, P'(x), in cents, is given by P'(x) = -0.0005x +0.27x + 38. 1x for x 500, where x is the number of members currently enrolled in the club. Approximate the total profit when 300 members are enrolled by 6 computing the sum P' (x) Ax with Ax = 50. i=1 The total profit when 300 members are enrolled is approximately $ (Round to the nearest cent as needed.) Marginal profit (in cents) 28,000P(x)= 22,400 16.800- 11,200- 5.600- 0- 0 1 11 100