To manufacture an initial run of a machine, a firm will invest $$750,000$ for manufacturing equipment, which should last six years, with straight$-$line depreciation and no salvage value. The tax rate would be $30\%.$ The initial selling price for a unit is expected to be $$12,000.$ Expected variable cost per unit is $$5000.$ Expected fixed costs, such as rent, utilities, and salaries, but excluding tax$-$deductible depreciation expense, would be $$250,000$ per year. Question a: Determine the number of unit sales needed for a breakeven operating profit. Question b: Assuming you could sell $60$ units per year, what would be the net present value at a $15\%$ discount rate? Please show steps for a BAII plus calculator