A retailer wants to implement a system to know when to order some of their perishable products. Due to seasonal demand for certain products as well as variable lead times this can be difficult to do$.$ Help the retailer to determine their reorder point for oranges during winter months, using the following information:

Average inventory used per day is $50$ bags, lead time for delivery is $4$ days, safety stock is $300$ bags.

$200$ units

$50$ units

$300$ units

$500$ units