The profit in dollars from the sale of x expensive watches is P(x) = 0.07x²-5x+2x02 - 5000.
Find the marginal profit when (a) x=400, (b) x= 1000, (c) x = 5000, and (d) x = 10,000.
(a) When x = 400, the marginal profit is $
(Round to the nearest integer as needed.)