please include excel functions

Dog Up! Franks is looking at a new sausage system with an installed cost of $385,000. This cost will be depreciated straight-line to zero over the project's five-year life, at the end of which the sausage system can be scrapped for $60,000. The sausage system will save the firm $135,000 per year in pretax operating costs, and the system requires an initial investment in net working capital of $35,000. If the tax rate (Use cells A6 to B12 from the given information to complete this question. You must use the built-in Excel function to answer this question. Taxes on the salvage value should be negative for a tax liability and positive for a tax credit.)