Riggs Company purchases sails and produces sailboats. It currently produces 1,280 sailboats per year, operating at normal capacity which is about 80% of full capacity. Riggs purchases sails at $255 each, but the company is considering using the excess capacity to manufacture the sails instead. The manufacturing cost per sail would be $97 for direct materials, $87 for direct labor, and $90 for overhead. The $90 overhead is based on $78,080 of annual fixed overhead that is allocated using normal capacity. The president of Riggs has come to you for advice. "It would cost me $274 to make the sails," she says, "but only $255 to buy them. Should I continue buying them, or have I missed something?" Prepare a per unit analysis of the differential costs. (Enter negative amounts using either a negative sign preceding the number eg. -45 or parentheses e.g. (45).) Make Sails Buy Sails Direct material $ $ Direct labor Variable overhead Purchase price Total unit cost Net Income Increase (Decrease) $