Please help me solve this problem using Excel. Thank you!

A telephone company is considering building a new automated switching distribution substation with a useful life of 20 years to support new suburban developments. The substation is located in a state in which the combined tax rate is 40%, and the telephone company uses a 15% real interest MARR to assess capital investment projects. Estimated real dollar revenues and costs are as follows: The substation will be put into service on the first day of the telephone company's fiscal year. Using MACRS depreciation, what will be the telephone company's after tax equivalent uniform annual worth for the substation