A local auto part store would like to reduce its inventory cost by determining the

optimal number of batteries to order $($i$.$e$.,$ EOQ$).$ The daily demand is estimated to

be six batteries; the unit purchase price is $$100$; the inventory carrying charge per

unit is $25?$the ordering cost per order is $$25$;the annual working days are $300$

days. The lead$-$time for acquiring batteries is estimated to be $4$ days.

With this information, which of the following is the order cycle time?

O $5$ days

$10$ days

O one day

O None of the above