please send solution for the most desirible alternative?

thank you

Two hazardous environment facilities are being evaluated, with the projected life of each facility being 10 years. The cash flows for each facility are shown in the table below. The company uses a MARR of 10%. Based on rate of return analysis, which is the most desirable alternative? Cash Flows Alternatives A B First Cost $300,000 $600,000 Annual M & O Costs $10,000 $20,000 Annual Benefit $70,000 $138.000 Salvage Value $45.000 $80,000