4. The company's contribution format income statement for the most recent year is given below: Total Per Unit Sales SR100,000 SR 10 Variable expenses SR 30,000 SR 3 Fixed expenses SR 60,000 Net operating income SR 10,000 (a) Compute the company's CM ratio and variable expense ratio. (b) Compute the company's break-even point in both units and sales dollars. Use the equation methodanned with (c) Compute the company's degree of operating leverage at the present level of sales