A machine cost is $50,000. fuel and minor repair cost is cost is # 15.00 per hour. a set of tire costs $3500 to replace. the estimated life of tire is 2800 use hours. after 8000 hours of work it will be sold 10 percent of purchase price. the machine is expected to work 1400 hours per year. the cost of capital rate is 7%. how much is the total annual cost ? approximately