4. Assume that the operating results for last year were as follows: Sales $360,000 Less: Variable expenses 144,000 Contribution margin 216,000 Less: Fixed expenses 198,000 Net operating income $ 18,000 a. Compute the degree of operating leverage at the current level of sales. b. The president expects sales to increase by 15% next year. By how much should net operating income increase? 5. Refer to the original data. Assume that the company sold 28,000 units last year. The sales manager is convinced that a 10% reduction in the selling price, combined with a $60,000 increase in advertising expenditures, would increase annual unit sales by 50%. Prepare two contribution format income statements: one showing the results of last year's operations, and one showing what the results of operations would be if these changes were made. Would you recommend that the company do as the sales manager suggests? 6. Refer to the original data. Assume again that the company sold 28,000 units last year. The president feels that it would be unwise to change the selling price. Instead, she wants to increase the sales commission by $2 per unit. She thinks that this move, combined with some increase in advertising, would double annual unit sales. By how much could advertising be increased with profits remaining unchanged? Do not prepare an income statement; use the incremental analysis approach.

Market efficiency refers to the market's ability to provide investors with all available information about investment options for buying and selling securities. Market efficiency reflects the true value of securities without undervaluing or overvaluing t…