$($a$)$ What are the optimal order quantity and the total inventory cost for Cyclorama given the data?

$($b$)$ Rob is optimistic about future demand. If annual demand becomes $3,000$ frames, what is the impact on the optimal order quantity?

$($c$)$ What is the impact if the annual demand is $4,000$ frames?

$($d$)$ In general, what happens to the order quantity and total inventory cost as demand increases?