A liquid form of penicillin manufactured by a pharmaceutical company is sold in bulk at a price of \(\$200\) per unit. If the total production cost (in dollars) for \(x\) units is \[ C(x)=500{,}000+80x+0.003x^2, \] and the production capacity of the firm is at most \(30{,}000\) units in a specified time, then how many units of penicillin must be manufactured and sold during that specified time to maximize the profit?