A land development company is considering the purchase of earth-moving equipment. This equipment will have an estimated first cost of $190,000, a salvage value of $70,000, a life of 10 years, a maintenance cost of $40,000 per year, and an operating cost of $260 per day. Alternatively, the company can rent the necessary equipment for $1100 per day and hire a driver at $180 per day. (a) 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? (b) Develop the spreadsheet graph