At the beginning of the compression process of the standard Diesel cycle, air is at 100 kPa

Question:

At the beginning of the compression process of the standard Diesel cycle, air is at 100 kPa and 298 K. If the maximum pressure and temperature during the cycle are 7 MPa and 2100 K, determine
(a) The compression ratio,
(b) The cutoff ratio,
(c) The thermal efficiency, and
(d) The mean effective pressure.