9. Chapman Corporation manufactures lamps. Management is currently studying whether the company should continue to make the cord assembly or purchase them from Palin Company for $5.25. Chapman needs 20,000 cord assemblies a year. If the part is purchased, the company can not use the released facilities for another manufacturing activity. Chapman's unit cost to manufacture the cord assembly is: Direct materials Direct labor Factory overhead (70% fixed) Total $2.25 1.75 2.50 $6.50 Required: what is The decision Chapman should make and the related differential income