Please show every step and no excel solutions...

Three mutually exclusive alternatives are being considered as welding tools at a job shop. The estimated cash flows for each alternative are given below: A B C Initial investment; $ $20,000 $15,000 $13,000 Annual Revenue; $/yr $6,000 $5,500 $5,000 Annual Expense; $/yr $1,000 $2,000 $3,500 Salvage value; $ $1,000 $600 $500 Useful life; years 12 12 If the MARR is 12%, which of these alternatives will you recommend for purchase using the Internal Rate of Return (ROR) analysis? (Note: there is no need to calculate the exact ROR value of your analyzed alternatives.)