Contribution margin ratio

a$.$ Coastal Company budgets sales of $$1,050,000,$ fixed costs of $$82,700,$ and variable costs of $$367,500.$ What is the contribution margin ratio for Coastal Company? $\%$

b$.$ If the contribution margin ratio for Bushner Company is $51\%,$ sales were $$448,000,$ and fixed costs were $$178,210,$ what was the operating income?