D. Try to choose the correct answer, note that four wrong answers will cancel one correct answer (i.e. each wrong answer will be penalized by -1 pt.): [ 4 pts. ] An industrial engineer is considering two alternative robots to purchase by a fiber optic manufacturing company. If a 8 .years study period is considered, which one of the following value is closest to the future worth of incremental (Y-X) cash flows at an interest rate of 12% per year? Robot X Robot Y Investment cost now, S 90,000 120,000 Annual operating cost, 28,000 15,000 Salvage value at the end of study period, S 12,000 21,000