For a certain item, the cost$-$minimizing order quantity obtained with the basic EOQ model was $200$ units and the total annual inventory $($carrying and setup$)$ cost was $$600.$ The inventory carrying cost per unit per year for this item is

Question $3$ options:

$$150\mathrm{.}00.$

$$3\mathrm{.}00.$

$$1\mathrm{.}50.$

$$30\mathrm{.}00.$

$$2\mathrm{.}00.$