Problem:
Machine A costs $20,000 , has a zero salvage value at any time, and has an associated labor cost pf $1.14 for each piece produced on it. Machine B costs $36,000 , has zero salvage value at any time , and has an associated labor cost of $0.85.Neither machine can be used except to produce the product described. If the interest rate is 10% and the annual rate of production is 20,000 unit, how many years will it take for the two machines cost to break even?