What can the weighted average contribution margin ratio be used for? To calculate an average per-unit contribution margin based on an assumed sales mix. To determine the extent of fixed costs in an organization's cost structure. To solve for a measure, at any level of sales volume, of the sensitivity of operating profit to changes in volume. To figure out the relative proportion in which a company's products (or services) are sold. Breakeven and profit planning for sales volume expressed in dollars (Y) rather than units (Q)