We are evaluating a project that costs $800,000, has an eight-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 60,000 units per year. Price per unit is $40, variable cost per unit is $20, and fixed costs are $800,000 per year. The tax rate is 35 percent, and we require a return of 10 percent on this project.

Calculate the change in NPV if sales were to drop by 500 units. (Enter your answer as a positive number. Do not round intermediate calculations and round your answer to 2 decimal places (e.g., 32.16).)