possible to show the work? I am getting a bit confused calculating the formulas

The Boring Corporation is considering a 3-year project with an initial cost of $750,000. The project will not directly produce any sales but will reduce operating costs by $420,000 a year. The equipment is depreciated straight-line to a zero book value over the life of the project. At the end of the project the equipment will be sold for an estimated $81,000. The tax rate is 34 percent. The project will require $19,000 in extra inventory for spare parts and accessories. Should this project be implemented if The Boring Corporation requires a rate of return of 15 percent? Why or why not