A gas within a piston-cylinder assembly executes a Carnot power cycle during which the isothermal expansion occurs at TH = 720 K and the isothermal compression occurs at TC = 340 K. Determine: (a) the thermal efficiency (b) the percent change in thermal efficiency if TH increases by 18% while TC remains the same. (c) the percent change in thermal efficiency if TC decreases by 18% while TH remains the same. (d) the percent change in thermal efficiency if TH increases by 18% and TC decreases by 18%(with sketch)