Problem #4 (30 points) The operating costs and market values for the current machine used to produce steel frames are given below for the next 5 years. Determine the economic service life for the defender assuming an MARR of 10%. Determine if the defender should be replaced by the given challenger (initial cost of $25,000) before the end of the defender's economic service life Defender Challenger Market Value $15.000 $10.000 $7,500 $5,000 S2,500 $0 Market Value $25,000 $20,000 $15.000 $8,000 $0 $0 ating Cost ating Cost 0 2 4 $5,000 $6.000 $7,000 $8,000 $9,000 $3,000 S3.000 $3.000 $3.000 $10,000