Glenn Ltd is launching a new product which it expects to incur a variable cost of $\$ 14$ per unit. The company has completed some market research to try to determine the optimum selling price with the following results.

If the price charged was to be $\$ 25$ per unit, then the demand would be 1,000 units each period. For every $\$ 1$ increase in the selling price, demand would reduce by 100 units each period. For every $\$ 1$ reduction in the selling price, the demand would increase by 100 units each period. Calculate the optimum selling price.