Suppose a machine has a current resale price of $5000 and an annual operating and maintenance cost of $1000. Each additional year thereafter, the operating and maintenance cost increases by six hundred and the resale value falls by forty percent. The firm has a MARR of 12%. Using marginal analysis, find the cost of keeping the machine for its fourth year of service. The answer is with $20 of 3283 3323 O 3363 3403 3443 None of the above