A cement manufacturer has supplied the following data: Tons of cement produced and sold 275,000 $979,000 $232,000 $313,000 $110,650 93,000 $230,350 Sales revenue Variable manufacturing expense Fixed manufacturing expense Variable selling and administrative expense Fixed selling and administrative expense Net operating income The company's contribution margin ratio is closest to: The company's contribution margin ratio is closest to: Multiple Choice 44.3% 65.0% 68.0% 23.5%