Calculate 7.5cm and 5cm for two storm events Stagger and add up their UH values properly Two grey water management systems are being considered for a site. System X has a first cost of $12,000 and annual operating costs of $3,000 per year. It is expected to have a life of 12 years with no salvage value. System Y can be purchased for $21,000 and it will have an annual operating cost of $1200. However, system Y will require an overhaul every 4 years at a cost of $2500. It will have a useful life of 12 years with a $1500 salvage value. Use incremental rate of return analysis to determine the alternative to be selected. The minimum acceptable rate of return is 13%. a) Show the incremental cash flow diagram. b) Show how the incremental rate of return is calculated and interpreted. Which investment should be selected? DO NOT SHARE THESE DIAGRAMS. THEY ARE ONLY FOR THE ANSWERS System X System Y System Y - X