Test. lest 4 This question: 4 point A company finds that the rate at which the quantity of a product that consumers demand changes with respect to price is given by the marginal-demand function 4000 D'(X) = x 2 where x is the price per unit, in dollars. Find the demand function if it is known that 1006 units of the product are demanded by consumers when the price is $4 per unit. D(x) =