1:58:16 A manufacturer of tiling grout has supplied the following data: Kilograms produced and sold 380,000 2,736,00 Sales revenue to Variable manufacturing expense $ 1,349,00 to to Fixed manufacturing expense Variable selling and administrative expense Fixed selling and administrative expense Net operating income $ 336,000 399,000 $ 372,000 $ 280,000 The company's contribution margin ratio is closest to: Select one: a. 63.9% O b. 71.1% O c. 28.9% d. 36.1%