An area can be irrigated by pumping water from a nearby river. Two competing installations are being considered. The MARR is 12% per year. At what level of operation (hours per year) would you be indifferent between the two pumping systems. The table below gives the different estimates needed to do the calculations. a) At what level of operation (hours per year) would you be indifferent between the pumping systems. b) Which pump will you select if the desire hours operation per year is 670 hours