An air- standard dual cycle has a compression ratio of 14 and a cutoff ratio of 1.2. The pressure ratio during the constant- volume heat addition process is 1.5. Determine the thermal efficiency,amount of heat added, the maximum gas pressure and temperature when this cycle is operated at80 kPa and 20°C at the beginning of the compression. Use constant specific heats at room temperature. (Put in thermal efficiency as answer in percent)