Over the past few years, Walmart Stores have replaced most of their hourly-paid cashiers with automated self-check-out machinery. What effect does this change have on Walmart's variable costs and operating leverage? Variable Costs Operating Leverage No effect Decrease O Variable Costs Operating Leverage Decrease Increase O Variable Costs Increase Operating Leverage Increase o Variable Costs Decrease Operating Leverage Increase o Variable Costs Operating Leverage Decrease Decrease If the fixed costs associated with a product decrease while variable costs and sales price remain constant, what will happen to the contribution margin and the breakeven point? o Contribution Margin Breakeven Point Decrease Increase O Breakeven Point Contribution Margin Unchanged Decrease O Breakeven Point Contribution Margin Unchanged Increase o Contribution Margin Breakeven Point Increase Decrease o O Breakeven Point Contribution Margin Unchanged Unchanged