Cullumber sells two different aluminum frames. Model X sells for $12 and has variable costs of $4.00. Model Y sells for $16 and has variable costs of $8.90. The sales mix of the three models is X,30% and Y,70%. Fixed costs are $51,590. How many units of Model X will Cullumber sell at break-even? (Round intermediate calculations to two decimal places (e.g., 5.25), and final answers to nearest whole number (e.g., 2,510).) Break-even in sales units units