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Question 1 of 5 3 Question 1 2 points Fire Antover A machine was purchased three years ago for $20,000, and has a current market value of $9,000. The machine can be kept for additional 3 years, and will have future salvage values of: 15,000 after 1 year $7,700 after 2 years $7,000 after 3 years A suitable challenger has an annual worth (AW) of $-2.000. Calculate the Economic Service Life (ESL] of the defender and devermine whether to keep it or replace it with the challenger, if the interest rate is 10% per year. O a. Keep the defender for ESL = 1 year b. Keep the defender for ESL = 3 years O e Replace with the challenger now O d, Keep the defender for ESL = 2 years