A 3 phase 20 km line delivers a load of 10 MW at 11 kV having a lagging power factor of 0.707 at the receiving end. The line has a resistance of 0.02 ?

per km per phase and an inductive reactance of 0.07 ? per km per phase. Calculate regulation and efficiency of the line. If now the receiving end power factor is raised to 0.9 lagging by using static capacitors, calculate the new value of regulation and efficiency