if sales are $820,000, variable costs are 45% of sales, and operating income is $260,000, what is the contribution margin ratio?

I If sales are $820,000, variable costs are 45% of sales, and operating income is $260 000 what is the contribution margin ratio? a, 32% b. 45% c. 55% 62% 0- Icon Koy b Multiple Choice 21-037 ctor 0