Prper Corp. is operating at 70% of capacity and is currently purchasing a part used in its manufacturing operations for $24 per unit. The unit cost for the business ta make the part is \$36, including fixed costs, and $26, not including fixed costs. If 15,000 units of the part are normally purchatsed during the vear but couid be manufacturnd using unused capocity, the amount of differential cost increasn or decrease from making the part rather than purchasing it would be a 130.000 coe inceras b. 530.000 cen deatane c. 5150,000 eost incriase A. 51k0,000 cem decrraie