Please help. Solve in excel, if you can, and show formulas.

A proposed cost-saving device has an installed cost of $745,000. The device will be used in a five-year project but is classified as three-year MACRS property for tax purposes. The required initial net working capital investment is $155,000, the marginal tax rate is 25 percent, and the project discount rate is 13 percent. The device has an estimated Year 5 salvage value of $110,000. What level of pretax cost savings do we require for this project to be profitable?

MACRS: Year 1: 0.3333 Year 2: 0.4445 Year 3: 0.1481 Year 4: 0.0741