Wear A Mask $($WAM$)$ begins a review of ordering policies for its continuous review system by checking the current policies for a sample of SKUs. Following are the characteristics of one item.

Demand $(d)=100$ units$/$week $($Assume $52$ weeks per year$)$

Ordering and setup cost $(S)=$$$75/$order

Holding cost $(H)=$$$\frac{13\mathrm{.}25}{?}$ unit$/$year

Lead time $(L)=6$ weeks

Standard deviation of weekly demand $=19$ units

Cycle$-$service level $=90$ percent, $z=1\mathrm{.}28$

What is the desired safety stock? $($Enter your response rounded to the nearest whole number.$)$