The $220\;v$ input is supplied to a transformer . The output circuit draws current of $2.0\;A$ at $440\;V$ If efficiency of transforms is $80\%$ te current drawn by primary circuit is

Question

$(a)\;3.6\;A \\(b)\;2.8\;A \\ (c)\;2.5\;A \\ (d)\;5.0\;A$