Cori's Dog House is considering the installation of a new computerized pressure cooker for hot dogs. The cooker will increase sales by $13,900 per year and will cut annual operating costs by $13,650. The new system will also prompt a $3,000 increase in net working capital. The system will cost $67,800 to purchase and install. This system is expected to have a 4-year life and will be depreciated to zero using straight-line depreciation and have no salvage value. The tax rate is 21 percent and the required return is 12.4 percent. What is the NPV of purchasing the pressure cooker? OCF=$ CFO=$ CF4=$ NPV=