An Office Manager uses a Periodic Review Inventory System: they check the inventory in their Office Supply Closet once every $10$ days, placing an order with their supplier depending on the inventory level in the closet. This week, the manager has counted $140$ post it notes in the closet. They have already placed an order with a supplier for $300$ post it notes that should arrive in $3$ days.

What is the Office Manager's Inventory Position?