Massa Machine Tools expects total sales of $$12,000.$ The price per unit is $$4.$ The firm estimates an ordering cost $$5\mathrm{.}64$ per order, with an inventory cost of $$0\mathrm{.}56$ per unit. What is the optimum order size?

Note: Round your answer to the nearest whole number.

Multiple Choice

$160$ units

$133$ units

$107$ units

$267$ units