Can you please correct any that are wrong. Thanks :)

When both fixed and variable costs go down, revenue goes up. O operating income goes up. O contribution margin goes down. O operating income goes down. Previous NextIf sales increase by 10%, then total contribution margin will increase more than 10%. increase by 10%. O increase less than 10%. O decrease by more than 10%.Cross Creek Company sells concrete culverts. Currently, the company's sales revenue is $900,000, variable costs total $450,000, and fixed costs total $300,000. If Cross Creek's controller has calculated the company's breakeven point to be $597,000, what is the company's margin of safety? O $447,000 O $153,000 $303,000 O $15,000Companies need to engage in target costing before introducing a new product. O at the end of a product's lifecycle. O at the beginning of an accounting period. O only if costs are primarily variable.If a company sells a single product and the selling price per unit and the variable cost per unit both increase by 5% while fixed costs remain the same, then contribution margin O per unit increases and breakeven in units decreases. O per unit increases and breakeven in units increases. O decreases and breakeven in units decreases. O remains the same and breakeven in units increases