System with an installed cost of $540,000.This cost will be depreciated straight-line to zero over the project's 5 year life, at the end system can be scrapped for $80,000.The system will save the firm $170,000 per year in pretax operating costs, and the system requires an initial investment in net working capital of $29,000.If the tax rate is 34% and the discount rate is 10%, what is the NPV of this project?

How can I work this out in excel