Problem $2$:

$(10$ points$)($Don$\text{'}$t give just the solution, explain how you reached to the value$)$

The demand for spring water at the Loblaws $600$ litres per week. The setup cost for placing an order to replenish inventory is $$25.$ The order is delivered by the supplier which charges Loblaws $$0\mathrm{.}10/$liter for the cost of transportation from the Ozark mountains to Loblaws. This transportation cost increases the cost of water to $$\frac{1\mathrm{.}25}{?}$ liter. The water loses its freshness while stored at the Loblaws. To account for this, the Loblaws charges an annual holding cost of $$\frac{2\mathrm{.}6}{?}$ liter. Determine how often the Loblaws should order for water and what size each order should be$.$