An experience curve based on a doubling of output is governed by the equation y = ax-b where . A curve based on tripling output would differ only in the b term, which would be calculated as . Suppose one work crew has an 85 percent experience curve based on doubling output while another crew has an 85 percent experience curve based on tripling output. If both crews take 200 hours to produce their first unit, how many units must be made before the doubling crew can finish a unit 25 hours faster than the tripling crew