Which one of the following is not considered an assumption of cost-volume-profit analysis? O a. Costs are nonlinear O b. Fixed cost per unit is not constant Oc. Costs can be divided into variable and fixed components O d. Sales mix of products sold does not change O e. Selling price per unit does not change with volume When performing sales mix analysis, which one of the following is true: O a. The sales mix is usually assumed to change. O b. Making changes to the sales mix will likely cause no change in the breakeven point Oc Producing and selling more units of the product with a higher contribution margin would likely decrease the breakeven point O d. Shifting the sales mix to the product with a lower contribution margin will likely increase the overall contribution margin O e. Normally the calculation of the breakeven point multiproduct is much simpler than that for a single product