A $$rm that sells $10,500$ blivets per month is trying to determine how many blivets to keep in inventory. The $$nancial manager has determined that it costs $$300$ to place an order. The value of the blivet is $$12\mathrm{.}00$ and the cost of holding inventory is $20\%$ of the value per year based on average blivet in inventory. A $$ve$-$day lead time is required for delivery of goods ordered. $($This lead time is known with certainty.$)$

What is the economic ordering quantity?