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Three single phase transformers are connected in delta-delta to step down a line voltage of 138 kV to 4160 V to supply power to a production plant. The plant draws 21 MW at a lagging power factor of 86 %. Calculate the apparent power furnished by the HV line. 

(A) 24.4 MVA (B) 48.8 MVA (C) 12.2 MVA (D) 6.1 MVA 

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