A decision must be made between two different machines, A and B$.$ The machines will produce the same product, but only one type of machine $($either A or B$)$ will be purchased. The company estimates that the selling price per unit for the product will be $$26.$ The variable cost of production per unit if machine $A$ is selected is believed to be $$9.$ The variable cost of production if machine $B$ selected is believed to be $$21.$ The fixed cost of machine $A$ is $$2,142,000,$ and the fixed cost of machine $B$ is $$607,500.$

a$.$ The break$-$even quantity is units if machine $A$ is selected. $($Enter your response as a whole number.$)$