Dog Up! Franks is looking at a new sausage system with an installed cost of $156,000. This cost will be depreciated straight-line to zero over the project's 9-year life, at the end of which the sausage system can be scrapped for $24,000. The sausage system will save the firm $48,000 per year in pretax operating costs, and the system requires an initial investment in net working capital of $11,200.

If the tax rate is 24 percent and the discount rate is 15 percent, what is the NPV of this project?

I dont know where to begin to figure this out