Henry Crouch's law office has traditionally ordered ink refills $70$ unils at a time. The firm eslimates that carrying cost is $45\%$ of the $$9$ unit cost and that annual demand is about $240$ units per year. The assumptions of the basic EOQ model are thought to apply. For what value of ordering cosl would its action be optimal?

a$)$ For what value of ordering cost would its action be optimal?

Its action would be optimal given an ordering cost of $ per order $($round your response to two docimal places$).$