plesse help! what is the best case and worst case

thank you!!!

We are evaluating a project that costs \\( \\$ 619,500 \\), has a seven-year life, and has no salvage value. Assume that depreciation is straight-line to zero over the life of the project. Sales are projected at 90,000 units per year. Price per unit is \\( \\$ 43 \\), variable cost per unit is \\( \\$ 30 \\), and fixed costs are \\( \\$ 705,000 \\) per year. The tax rate is 22 percent, and we require a return of 11 percent on this project. Suppose the projections given for price, quantity, variable costs, and fixed costs are all accurate to within \\pm 10 percent. Calculate the best-case and worst-case NPV figures. (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.)