A manufacturer of tiling grout has supplied the following data:

Kilograms produced and sold $310,000$

Sales revenue $ $1,940,000$

Variable manufacturing expense $ $959,000$

Fixed manufacturing expense $ $264,000$

Variable selling and administrative expense $ $357,000$

Fixed selling and administrative expense $ $230,000$

Net operating income $ $130,000$

The company's contribution margin ratio is closest to: