Final answer:
To calculate the upper and lower bounds for the projections, you should consider a 10% increase and decrease in sales and variable costs. The base-case NPV can be calculated by discounting the cash flows at the required rate of return. The best and worst case IRR scenarios can be found by finding the discount rate that makes the NPV equal to zero for the upper and lower bounds of the projections.
Step-by-step explanation:
To calculate the upper and lower bounds for the projections, we need to calculate the upper and lower values for unit sales and variable costs. If we assume a 10% increase in sales, the upper bound for unit sales would be 180 + 10% = 198 units/year. If we assume a 10% decrease in sales, the lower bound would be 180 - 10% = 162 units/year. Similarly, if we assume a 10% increase in variable costs, the upper bound for variable costs would be $9,800 + 10% = $10,780/unit. If we assume a 10% decrease in variable costs, the lower bound would be $9,800 - 10% = $8,820/unit.
The base-case NPV can be calculated by discounting the cash flows (sales - variable costs - fixed costs - depreciation) at the 12% rate of return. The best and worst case IRR scenarios can be calculated by finding the discount rate that makes the NPV equal to zero for the upper and lower bounds of the projections.