10. A new grader has a new purchase price of $200,000, an estimated life of eight years and an estimated salvage value of $35,000. Annual maintenance is expected to cost $2,500 per year for the first 4 years of the equipment's life and it is expected to increase it $4,000 for the final 4 years of its life. The annual interest rate is 7%. a. What is the present worth cost of the salvage value? b. What is the present worth cost of the annual maintenance? c. What is the present worth cost of the purchase price? d. What is the present worth cost of owning and operating the grader for the next eight years