4. assume that 1000 cfm of outside air at 100 f dry bulb temperature and 80% relative humidity is mixed with 6000 cfm of recirculating air at 75 f dry bulb and 50% relative humidity and the mixture enters an air conditioning (a/c) unit. the mixture is then cooled and dehumidified through the a/c unit to outlet temperature of 55 f (dry bulb) and 40% relative humidity. determine the following