Urgent solution required don't use method previous used

In a steam turbine, steam enters at $8$MPa,$550C,$ and $50\frac{m}{s}$ and leaves at $20$ kPa and $90$

$\frac{m}{s}$ with a moisture content of $10\%.$ The turbine is not adequately insulated, and it is estimated

that the heat is lost from the turbine of $180$ kW $.$ The power output of the turbine is $4\mathrm{.}25$ MW $.$

Assuming surroundings to be $100$ kPa and $25C,$ determine:

i$.$ the reversible power output of the turbine $($unit: MW$),$

ii$.$ the exergy destroyed within the turbine $($unit: MW$),$

iii. the second law efficiency $($unit: $\%),$ and

iv$.$ the possible increase in the power output of the turbine if the turbine were perfectly

insulated $($unit: kW $).$