$(15$ points$)$ A company purchases auto spare parts from $$mit and assume that the lead time is constant

and $3$ days. The weekly demand is uniform and it is $400$ units, order cost is $300TL,$ unit cost is $50TD$ and

inventory holding cost rate is $10\%$ of the unit cost. If the company works $50$ weeks in a year, what should

be the quantity per order and the reorder point? What would be the total cost?