c$.$ What is the average inventory? $($Round your answer to $1$ decimal place.$)$

Average inventory $,62\mathrm{.}5$ units

d$.$ What is the annual ordering cost? $($Round your answer to $2$ decimal places.$)$

Annual ordering cost

e$.$ What is the annual inventory carrying cost? $($Round your answer to $2$ decimal places.$)$

Annual inventory carrying cost