If sales are $798,000, variable costs are 73% of sales, and operating income is $254,000, what is the contribution margin ratio? O a. 69% O b. 31% O c. 73% O d. 27%

If sales are $798,000, variable costs are 73% of sales, and operating income is $254,000, what is the contribution margin ratio? a. 69% b. 31% c. 73% d. 27%