Computing the average return and standard deviation

You are considering a new product launch. The project will cost $870,000, have a 4-year life, and have no salvage value; depreciation is straight -line to zero. Sales and projected at 210 units per year; price per unit will be $20,000. Variable cost per unit will be $16,000, and fixed costs will be $348,000 per year. The required return on the project is 15 percent, and the relevant tax rate is 36 percent.
The sensitivity of your base-case NPV to changes in fixed costs is $__________. (Negative amount should be indicated by a minus sign. Round your answers to 2 decimal places, e.g. 32.16)