local supermarket needs your help in determining the optimal ordering policy for a stainless

$-$

steel vacuum bottle. The demand for this water bottle is

$2$

$0$

$$units per day. The store pays a unit cost of $

$1$

$5$

$$per bottle and a fixed ordering cost of $

$1$

$5$

$0$

$$per order. The annual unit holding cost of inventory is estimated to be

$2$

$5$

$\%$

$$of the unit cost. The store operates

$2$

$5$

$0$

$$days a year.