Daily demand for $52$ flat$-$screen TVs at Sarah$$s Discount Emporium is $5$ units, with a standard deviation of $2.$ Sarah utilizes a P$-$model to replenish the inventory. The review period is $20$ days, and the lead time is $10$ days. This time of the review, she realizes that the current inventory position is $50.$ If only a $1$ percent risk of stocking out is acceptable $($z$-$score $=2\mathrm{.}33),$ how many units should she order?