A manufacturer of cedar shingles has supplied the following data:

Bundles of cedar shakes produced and sold 247,000

Sales revenue $2,000,700

Variable expense:Variable manufacturing expense $973,700

Variable selling and administrative expense 258,700 1,232,400

Contribution margin 768,300

Fixed expense: Fixed manufacturing expense 484,000

Fixed selling and administrative expense 273,000 757,000

Net operating income $11,300

The company's contribution margin ratio is closest to: (Do not round intermediate calculations. Round your answer to whole percentage.)