can somebody please help me with this question thanks

If McDonnell Manufacturing has a MARR of 20%, inflation is 2.75%, and the company uses present worth analysis with a planning horizon of 15 years in making economic decisions, which of the following alternatives would be preferred? Alternative A Alternative B Initial costs $236,000 $345,000 Annual operating costs 64,000 38,000 Annual maintenance costs 4,000 5,000 Salvage value (EOY 20) 23,000 51,000