A land development company is considering the purchase of earth-moving equipment. The equipment will have a first cost of $190,000 and a salvage value of $70000 when the company sells it in 10 years. A service contract for maintenance on the equipment will cost $40000 per year. The operating cost is expected to be $260 per day. Alternatively, the company can rent the necessary equipment for $1100 per day and hire a driver at $180 per day. If the company's MARR is 10% per year, how many days per year must the company need the equipment in order to justify its purchase?