A manufacturer of tiling grout has supplied the following data Kilograms produced and sold Sales revenue Variable manufacturing expense Flxed manufacturing expense Variable selling and administrative expense Flxed selling and administrative expense Net operating Income 390,000 $1,860,000 $951,000 $248,000 $333,000 $114,000 The company's contribution margin ratio is closest to o 75.2% o 48.9% o 82.1% o 31.0%