An electrochemical machining (ECM) is to be used to cut a through hole into a $12$ mm thick aluminum plate. The hole has a rectangular cross-section. $10 \: mm \times 30 \:mm$. The ECM operation will be accomplished in $2$ minutes, with efficiency of $90 \%$. Assuming specific removal rate for aluminum as $3.44 \times 10^{-2} \: mm^3/(A \: \: s)$, the current (in A) required is __________ (correct to two decimal places).
