C$\backslash$bar $($a$)$ u h$$i $\frac{1}{35}$ tr$$ l$$i: $0.$

$$ xem nh$$ng ch$$a tr$$ l$$: l$.$

Sweet cider is delivered weekly to Pappy's Produce stand. Demand varies uniformly between $300$ liters and $500$ liters per week. Pappy pays $20$ cents per liter for cider and charges $80$ cents per liter for it$.$ Unsold cider has no salvage value and cannot be carried over into the next week due to spoilage. Find the optimal stocking level and its stock out risk for that quantity.

A$.500$ liters; $30\%$

B$.500$ liters; $25\%$

C$.450$ liters; $20\%$

$$ D$.450$ liters; $25\%$