Great Lakes Boat Company manufactures sailboat hulls at a cost of $4,200 per unit. The hulls are sold to boat yards for $5,000. The company is evaluating the desirability of adding masts, sails, and rigging to the hulls prior to sale at an additional cost of $1,500. The completed sailboats could then be sold for $6,000 each.

Calculate the net benefit (cost) of processing the boat hulls into sail boats. Assume sales volume will not be affected. Use a negative sign with your answer, if appropriate.