12. A round shaft 6.5 in. OD has a specified length of 31.675 in. The facing dimension necessary for a smooth end finish is 1/16 in. The width of the lathe cutoff tool is 3/16 in. The length of the raw bar stock is 12 ft. The lathe b/in3 collet requires a minimum of 4 in. for pripping the last part. The material costs $0.95/lb and has a density of 0.29 (a) Determine the number of pieces that can be removed from the raw bar (b) What is the unit cost for the raw material? (c) what is the value of material that is lost to waste, given that waste material has a salvage value of 10% of the original value? (d) Find the shape yiel