$4\mathrm{.}1\mathrm{.}1$ Compute the economic order quantity $($EOQ$)$ of the packets of medicine. $(3$ Marks$)$

$4\mathrm{.}1\mathrm{.}2$ Based on the ordering policy stated above, compute the total annual ordering and holding costs of the medicine. $(3$ Marks$)$

$4\mathrm{.}1\mathrm{.}3$ How much money can SOSGH save by replacing the existing inventory policy with the economic order quantity $($EOQ$)$ model? $(5$ Marks$)$