Forrester Company is considering buying new equipment that would increase monthly fixed costs from $300,000 to $648,000 and would decrease the current variable costs of $70 by $10 per unit. The selling price of $120 is not expected to change. Forrester's current break- even sales are $720,000 and current break-even units are 6,000. If Forrester purchases this new equipment, the revised contribution margin ratio would be