15) A manufacturer of tiling grout has supplied the following data: Kilograms produced and bld 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: A) 28.9% B) 63.9% C) 71.1% D) 36.1% 380,000 $ 2,736,000 $ 1,349,000 $ 336,000 $ 399,000 $ 372,000 $ 280,000