Question 4 (15 points) [15 Marks] Sunflower Technologies is considering replacing an old harvesting machine which was purchased 12 years ago at a cost of $25,000. It has a current market value of $4,500. If the company spends $1,000 to recalibrate the machine, it would extend the life of the harvesting machine for another 3 years with the following estimated salvage values and operating costs: Yearo Salvage value Overhaul cost O&M cost 0 $4,500 $1,000 1 $3,200 $3,300 2 $2.000 $4,300 3 $1,600 $5,200 A newer and less energy-intensive harvesting machine can be installed for $10,000. This new harvesting machine would have an economic life of 3 years, with an equivalent annual cost of $5.700. The company's MARR is 11%. a) What is the remaining economic service life of the old machine with overhaul? b) What is your decision, should the defender be replaced now? And if not, what is the cost of keeping it for one more year