The Niendorf Corporation produces teakettles, which it sells for $15 dollars each. Fixed costs are $700,000 for up to $400,000 units of output. Variable costs are $10 per kettle. (a) What is the operating breakeven point? Illustrate by means of a chart. (b) What is Niendorf's degree of operating leverage at sales of (i) 125,000 units and (ii) 175,000 units?