Water is the working fluid in an ideal Rankine cycle. Saturated vapor enters the turbine at 6.9

Question:

Water is the working fluid in an ideal Rankine cycle. Saturated vapor enters the turbine at 6.9 MPa. The condenser pressure is 6.9 kPa. Determine
(a) The thermal efficiency (ηth) and (d) the back-work ratio.
(b) The net work per unit mass (wnet) of steam flow in kJ/kg,
(c) The heat transfer (q) to the steam passing through the boiler in kJ/kg,