IM$\mathrm{.}65$ Boeing orders a small part $($component$)$ used in many of its wing assemblies. Below is some information on this part:

Cost per case $=$ $$415$

Parts per case $=56$

Daily usage of parts per day $($demand$)=33$

Standard deviation of daily demand $=13$

Purchasing lead time $($in days$)=21$

Desired service level $=88\%$

Ordering $($administrative$)$ costs $=$ $$330$

Annual interest earned on cash $=8\%$

Assume that Boeing operates $365$ days per year

What should be the safety stock for this part $($in parts, not cases$)?($Display your answer to two decimal places.$)$