9 2 points Serfass Corporation's contribution format income statement for July appears below: Sales Variable expenses Contribution margin Fixed expenses Net operating income $ 254,400 127,200 127,200 35,620 $91,580 The degree of operating leverage is closest to: 0.72 1.39 0.36 2.00 10 2 points A cement manufacturer has supplied the following data: Tons of cement produced and sold 235,000 Sales revenue $ 1,010,500 Variable manufacturing expense $ 416,000 Fixed manufacturing expense $ 275,000 Variable selling and administrative expense $ 54,000 Fixed selling and administrative expense $ 215,000 Net operating income $ 50,500 What is the company's contribution margin? (Round your intermediate calculations to 2 decimal places.) $1,010,500 $594,500 $540,500 $319,500