Knoll, Inc. currently sells $15,000$ units a month for $$50$ each, has variable costs of $$20$ per unit, and fixed costs of $$300,000.$ Knoll is considering increasing the price of its units to $$60$ per unit. If the price is changed, how many units will Knoll need to sell for profit to remain the same as before the price change?

A$)11,250$ B$)10,000$ C$)12,000$ D$)12,500$