Tons of cement produced and sold Sales revenue Variable manufacturing expense Fixed manufacturing expense Variable selling and administrative expense Fixed selling and administrative expense Net operating income 295,000 $999,000 $236,000 $325,000 $153,610 $ 97,000 $187,390 The company's contribution margin ratio is closest to: Multiple Choice O 18.8% 18.8% 61.0% 0 61.0% 43.8% 0 67.5%