A monopoly firm faces the output demand curve P = 25 - 0.5Q,where P is the price of the final product and Q is the level of output.The production function is given by Q = 5X,where X is the only input used in production.Each unit of X is bought by the firm at a constant price of $25 per unit.Based on this information,what level of input would the profit-maximizing monopoly employ?