If we have two stage expansion of the steam in the turbines with efficiency 88 % each. then how we can calculate the values of the enthalpies at the exit of each turbine. At the entry of first turbine we have steam at the rate of 50000 lb/h, Pressure is 600 lbf/in2 Temperature is 700 F. Pressure after the first stage expansion is 30 lbf/in2 and pressure after the second stage turbine expannsion is 1lbf/in2?