A cement manufacturer has supplied the following data:
1.Tons of cement produced and sold 315,000 Sales revenue $ 1,019,000
2.Variable manufacturing expense $ 240,000
3.Fixed manufacturing expense $ 337,000
4.Variable selling and administrative expense $ 167,600
5.Fixed selling and administrative expense $ 101,000
6.Net operating income $ 173,400
7.The company's contribution margin ratio is closest to.