A100-KVA, 1200/120 V, Y-A, 3-6 transformer has per phase excitation branch impedance of 100 KS2 || j200 KS2 and per-phase series impedance of 0.1 + j0.2 2 (both referred to the low- voltage side, i.e., secondary). Using the per-phase equivalent circuit of the transformer, find transformer's VR for a Y-connected 3-0 load drawing rated current at 0.9 PF lagging. Assume rated voltage of 1200V for the primary.