Sharp Inc., is a company that markets painless hypodermic needles to hospitals. Marsha, it's CEO, would like to reduce its inventory cost by determining the optimal number of hypodermic needles to obtain per order. The annual demand is $1,000$ units and the ordering cost is $$10$ per order. The carrying cost per unit is $$0\mathrm{.}50.$ Using these figures, calculate the expected number of orders per year.