5. An ideal Otto engine, operating on an air standard with k=1.35 has a compression ratio of 5. At the beginning of the compression the volume is 6ft, the pressure is 13.75psia and the temperature is...

Please answer letters c and d. Thank you!

Extracted text: 5. An ideal Otto engine, operating on an air standard with k=1.35 has a compression ratio of 5. At the beginning of the compression the volume is 6ft, the pressure is 13.75psia and the temperature is 100°F. During the constant volume heating, 340Btu of heat are added per cycle. Calculate (a) % clearance, (b) Peak temperature and pressure of the cycle ("F and psia), (c) thermal efficiency (%) and (d) mean effective pressure in psia.