The Shellout Corp. owns a piece of petroleum drilling equipment that costs $300,000 and will be depreciated over 10 years by double declining balance depreciation. There is a combined 30% tax rate. Shellout will lease the equipment to others and each year receive $165,000 in rent. At the end of 5 years, the firm will sell the equipment for $80,000. What is the after-tax rate of return Shellout will receive from this equipment investment?

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.