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 380,000 $2,736,000 $1,349,000 $ 336,000 $ 399,000 $ 372,000 $ 280,000 The company's contribution margin ratio is closest to: The company's contribution margin ratio is closest to: Multiple Choice O 28.9% 63.9% 71.1% 36.1%