Calculating thermal efficiency and mean effective pressure from the Rhino Cycle.

The Rhino Cycle is the basis for the engine which powers the Rhino Car.  The cycle consists of:

1-2: Isentropic compression from 1.0 bar and 300K to 10 bars
1-3: Constant pressure heat addition of 850 KJ/KG
3-4: Isothermal expansion to 9 bars
4-5: Isentropic expansion to 1.0 bar
5-1: Constant pressure cooling

Determine the cycle thermal efficiency and the mean effective pressure.