Rhinefold brews reduced calorie beer and regular beer. Sales of its reduced calorie beer represent 25% of the company's total revenue. Sales of regular beer represent the remaining 75%. Reduced calorie beer has a contribution margin ratio of 80%, whereas the contribution margin ratio of regular beer is only 60%. Rhinefold's monthly fixed costs average $609,500.

B. What monthly sales level must be achieved for Rhinefold to earn a monthly operating income of $350,000?