Problem 3 - Given the following data and using the present worth analysis: First cost Annual Maintenance and Operating costs Annual benefits Salvage value Model A Model B Model C $52,000 $63,000 $67,000 $15,000 $9,000 $12,000 $38,000 $31,000 $37,000 $13,000 $19,000 $22,000 4 6 12 Useful life, in years a) Draw the CFD for each alternative. b) Determine the best alternative at an interest rate of 10% per year.