Blue Lake Marina sells a maker of cruiser for $16 800. This regular selling price covers overhead of 15% of cost and a normal net profit of 10% of cost. The cruisers were marked with a price so that the marina can offer a 20% discount while still maintaining its regular gross profit. At the end of the boating season, the cruiser was marked down. The marina made 25% of its usual profit and reduced the usual com- mission paid to the sales personnel by 33 1⁄3%. The normal commission accounts for 50% of the normal overhead. What was the rate of markdown?