A mechanical testing machine with an initial cost of exist11,000 closely follows the cost pattern shown below: Assume that replacement equipment will follow the same cost pattern What is the economic service life of the machine if MARR is 0%? A. 2 years B. 4 years C. 3 years D. 1 year At an interest rate of 8% the annual cost of machine if it is kept for three years is closest to A. exist6.118 B. exist5.377 C. exist6.234 D. exist5.314