Cori's Dog House is considering the installation of a new computerized pressure cooker for hot dogs. The cooker will increase sales by $14,100 per year and will cut annual operating costs by $15,600. The new system will also prompt a $1,300 increase in net working capital. The system will cost $55,800 to purchase and install. This system is expected to have a 4-year life and will be depreciated to zero using straight-line depreciation and have no salvage value. The tax rate is 21 percent and the required return is 13.1 percent. What is the NPV of purchasing the pressure cooker?