pls help

We are evaluating a project that costs $776,000, has a life of twelve years, and has no salvage value. Assume that depreciation is straight-line to zero over the life of the project. Sales are projected at 83,000 units per year. Price per unit is $38, variable cost per unit is $24, and fixed costs are $786,088 per year. The tax rate is 23 percent, and we require a return of 19 percent on this project. The projections given for price, quantity, variable costs, and fixed costs are all accurate to within +116 percent. a. Calculate the best-case NPV. Best case b. Calculate the worst-case NPV