"Artists' Advantage" sells painting supplies. 2080 units of the most basic brush for watercolors, the T100, are sold a year. The order cost is $30 per order, and the holding cost is $3.00 per box. The lead time for an order is 3 weeks, and the standard deviation of demand is 6 boxes per week.

What is the optimal order quantity of brushes?

What is the optimal number of orders per year?

Compute the period that most closely matches this EOQ.