Randall-Rico Consultants, 5 years ago, purchased for $45,000 a microwave signal graphical plotter for corrosion detection in concrete structures. It is expected to have the market values and annual operating costs shown for its remaining useful life of up to 3 years. It could be traded now at an appraised market value of $8000. A replacement plotter with new Internet-based, digital technology costs $125,000, has an estimated salvage value of 8% of the purchase price after its 5 -year life, and an AOC of 20% of its purchase price. At an interest rate of 15% per year, answer the following questions. (Algebraic signs matter) (The type of work for this equipment will likely be long term.) a. What is the ESL of the defender? year(s) b. What is the TAW associated with the choice in part a? dollars c. What is the TAW for the challengers 5 years of service? dollars d. What is the TAW for keeping the defender for 3 years? dollars e. Based on the above and your understanding of costs (TAW), how long should the defender be kept in service? Keep the defender 0 years, replace it with the challenger now. Keep the defender 2 years then replace it with the challenger. Keep the defender forever. Keep the defender 3 years then replace it with the challenger