15. If the estimated lifetime benefit of a system is $900,000 and the estimated lifetime cost of the system is $700,000. a. What is the estimated lifetime Return On Investment (ROI)? (First, state the formula). ROI Formula = (Ending Value/ Beginning Value)^(1/# of Years) - 1 b. What is the annual percentage of the ROI if the estimated cost/benefit is for 5 years duration? I c. What is the real annual cash value of the system