In a Dual cycle, the volume at the beginning of the isentropic compression is 0.88 L and the pressure is 1 bar. If the swept volume of the cycle is 0.81 L, the volume ratio during the constant pressure heat addition process is 2.2, the pressure ratio during the constant volume heat addition process is 1.95, the specific heat ratio is y=1.32 and the heat rejected is 446.3 kJ/kg, the work done in kJ per kg of air is: Select one: a. 450.0 O b. 705.2 O c. 621.4 d. 124.5