$$ A three$-$phase transformer, $300$MVA, $60$Hz$,$ has a voltage of $145$V$,$ and a power angle $$ of $45.$ Calculate the following: $1.$ total current that the transformer can handle $2.$ Maximum real power the transformer can produce $3.$The total reactive power required for the transformer $4.$If the transformer feeds a circuit having an inductance of $145$mH and a resistance of $25$K$,$ find the impedance of the transformer. Find the efficiency of the circuit