1. Mfg. for $8.13 per screw. Screw U guarantees that price for at least three years. Or, Nuts & Bolts Mfg. can make the same screw and incur the following costs per screw: (Nuts & Bolts Mfg. expects labor cost to rise by 5% within the next two weeks. $2.69 Direct Labor* Direct Material Incremental OH 3.72 1.60 a. What would be the total cost per unit after the anticipated increase in direct labor? b. Should Nuts & Bolts make the part or purchase it from Screw U? Make Buy