A manufacturer of tiling grout has supplied the following data:

Kilograms produced and sold		380,000
Sales revenue	$	2,736,000
Variable manufacturing expense	$	1,349,000
Fixed manufacturing expense	$	336,000
Variable selling and administrative expense	$	399,000
Fixed selling and administrative expense	$	372,000
Net operating income	$	280,000

The company's contribution margin ratio is closest to:

Multiple Choice

28.9%

63.9%

36.1%

71.1%