To manufacture an initial run of a machine the firm will invest $$750,000$ for manufacturing equipment, which should last six years, with straight line depreciation and no salvage value. The tax rate would be $30\%.$ The initial selling price for a unit is $$7,000.$ Fixed costs, excluding tax$-$deductible depreciation expense, would be $$250,000$ per year. a$)$ If you sell $60$ units per year, what it the payback period fo rthe initial investment? b$)$ What is the IRR c$)$ What would the selling price have to be to generate a NPV of $$150,000$ at a $15\%$ discount rate