Consider a building in Denver, Colorado, with 70,000 cfm single-duct CV AHU. The building is occupied 60 hours per week with 500 people. The indoor temperature is always maintained at 73°F. Fuel cost is $4.50/106 Btu. Electricity cost is $0.09/kWh. The fan pressure differential inside the AHU is 4.0 in. The fan has efficiency of 0.78 and is operating 80 hours per week. Determine the cost savings incurred by converting this CV to a VAV system.