What is the total annual cycle$-$inventory cost $($i$.$e$.,$ holding cost $+$ ordering cost$)$ of the two parts, respectively, based on their current ordering quantity?

What is the economic order quantity $($EOQ$)$ for the two parts? What would be the total cost $($i$.$e$.,$ holding cost $+$ ordering cost$)$ of the two parts, respectively, if they were to switch to EOQ? How are they different from the current costs?

What are the reorder points $($R$)$ for the two parts, respectively, if Sue were to adopt a continuous$-$review system $($Q$-$system$)?$

What are the time between orders $($P$)$ and the target inventory $($T$)$ for the two parts, if Sue were to adopt a period$-$review system $($P$-$system$)?$

Which ordering system $($Q or P$)$ would you recommend for each of the two parts? Why?