Please solve it quickly Thank you very much

Which alternative if any should be selected based upon a prescnt worth analysis considcring that i = %8? A1 (Electric Power) A2 (Gas Power) First Cost: $57,500 First Cost: $82,900 Ann. Operating cost: $22,220 Ann. Operating Cost: $19,720 Salvage Value: $6,800 Salvage Value: $ 8,880 Annual benefit: $23,000 Annual benefit: $33,000 Life: 4 years Life: 6 years A3 (Solar Power) First Cost: $100,500 Ann. Operating cost: $3,250 Salvage Value: $3,330 Annual benefit: $40,000 Life: 8 vears Maximum file size: 30MB, maximum number of files: 1