The tables below show the operating costs and salvage value for a machine that was purchased for $50,000 and has a useful life of 3 years. Find its economic life using a MARR of 10% Machine A Year Operating Costs Salvage Value 1 $10,000.00 2 $40,000.00 3 $70,000.00 Machine B Year Operating Costs Salvage Value 1 $10,000.00 $30,000.00 2 $10,000.00 $20,000.00 $10,000.00 0