An Office Manager uses a Periodic Review Inventory System: they check the inventory in the Office Supply Closet once every

$10$ days, placing an order with their supplier depending on the inventory level in the closet. The manager has set a restocking

level of $500$ highlighters for their closet. This week, the manager has counted $180$ highlighters in the closet.

How many highlighters will the manager order from their supplier? In other words, what is the Order Quantity?

Order Quantity: Q $=$ R $-$ I, where

$R=$ restocking order$-$up$-$to level

I $=$ inventory level at the time of review

Minimum Restocking Level $=d(RP)+d(L)$

$RP=$ reorder period: time between orders

$L=$ replenishment lead time $($time periods$)$

$d=$ average demand per time period

$338$ highlighters

$680$ highlighters

$500$ highlighters

$370$ highlighters

$320$ highlighters