Solution and Explanation:
Annual savings in cost:
Savings in Labour and OH cost (8500 units at 2.20) 18700
Add: Savings in fixed cost 4400
Less: Increase in material cost (8500 units at 0.25) 2125
Net annual savings in cost 20975
Present annuity factor for 6 years at 5% 5.0757
Present value of Annual savings in cost 106462.8
Add: Present value of Salvage value of new equipment 22386
($ 30,000 with PVF at 0.7462)
Add: Salvage value of existing machine 30,000
Total Present value of cash inflows 158,849
Less: Initial investment 145,000
Net present value 13,849