If annual demand is $12,000$ units, the ordering cost is $$6$ per order, and the holding cost is $$2\mathrm{.}50$ per unit per year, which of the following is the optimal order quantity using the economic order quantity model?

Question $10$ options:

$576$

$60\mathrm{.}56$

$56\mathrm{.}03$

$120\mathrm{.}4$

$240$