A manufacturer of tiling grout has supplied the following data: Kilograms produced and sold Sales revenue Variable manufacturing expense Fixed manufacturing expense Variable selling and administrative expense Fixed selling and administrative expense Net operating Income 500.000 $1,810.000 $940,000 $226,000 $364.000 $192.000 $88,000 The company's contribution margin ratio is closest to: 28.0% 0 76.9% 48.1% 0 79.9%