Baylor Lumber Products is considering the purchase of a high-efficiency conveyor system. Two manufacturers have approached Baylor with proposals: (1) Duke Industries and (2) Wake Manufacturing. Regardless of which vendor Baylor chooses, the following incremental cash flows are expected to be realized. Year Incremental Cash Inflows Incremental Cash Outflows 1 $ 29,000 $ 23,000 2 30,000 24,000 3 35,000 29,000 4 38,000 32,000 5 37,000 31,000 6 36,000 30,000 a. If the machine manufactured by Duke Industries costs $30,000, what is its expected payback period? b. If the machine manufactured by Wake Manufacturing has a payback period of 48 months, what is its cost? c. Which of the machines is most attractive based on its respective payback period