$12-30$ The demand for barbeque grills has been fairly large in the past several years, and Estate Supplies, Inc., usually orders new barbeque grills five times a year. It is estimated that the ordering cost is $$60$ per order. The carrying cost is $$10$ per grill per year. Furthermore, Estate Supplies, Inc., has estimated that the stockout cost is $$50$ per unit. The reorder point is $650$ units. Although the demand each year is high, it varies considerably. The demand during the lead time is as follows $($see Table for Problem $12-30$ at the top of the next page$).$ The lead time is $12$ working days. How much safety stock should Estate Supplies, Inc., maintain?