1) [15 points) A used bulldozer with a remaining life of 5 years and $10,000 salvage value can be purchased for $40,000. The annual maintenance cost is expected to $20,000 per year. In addition, operating costs are expected to be $25 per hour. Alternatively, a new bulldozer can be rented for $150 per hour. At an interest rate of 10% per year, what is the minimum number of hours per year the used bulldozer must be utilized to justify its purchase (i.e. the number of hours per year that will equalize the cost of both bulldozers)