Problem $20-21$

Item $x$ is a standard item stocked in a company's inventory of component parts. Each year the firm, on a random basis, uses about $2,400$ of item $x,$ which costs $$25$ each. Storage costs, which include insurance and cost of capital, amount to $$4$ per unit of average inventory. Every time an order is placed for more item $x,$ it costs $$18.$

a$.$ Whenever item $x$ is ordered, what should the order size be$?($Round your answer to the nearest whole number.$)$

Order size

b$.$ What is the annual cost for ordering item $x?($Round your answer to $2$ decimal places.$)$

Ordering cost

$

c$.$ What is the annual cost for storing item $x?($Round your answer to $2$ decimal places.$)$

Holding cost

$