(Based on problem 8.9 of Hyman, Fundamentals of Engineering Design, Prentice-Hall, 2nd ed., 2003.) You are considering upgrading some manufacturing facilities by purchasing one of three different machines, each with the same production capacity. Machine A costs $40,000, has a useful life of 20 years, annual maintenance costs of $2500, and salvage value of $5000. Machine B costs $30,000, has a useful life of 10 years, annual maintenance of $3000, and salvage value of $3000. Machine C costs $15,000, has a useful life of 5 years, annual maintenance of $5000, and no salvage value. You are planning for a total period of operation of 20 years. Assume that (i) Machines B and C will be replaced one or more times by identical new units at the end of their useful lifetimes and (ii) machine purchase prices, annual maintenance, and discount rates are constant throughout the analysis period. A. Which is the most economical choice, based on total costs without considering time value? Which is the best choice, based on minimizing annualized value of total costs over the 20-year period, assuming i = 7% / year? Provide a spreadsheet similar to Tables 8.1 or 8.3 in the text. B. What is the Benefit/Cost ratio (as a percentage return on investment) during the first five years of operation for the reduced annual maintenance cost versus the increased initial machine cost for (i) Machine A compared to Machine C and (ii) Machine B compared to Machine C