Please help with $4$a $4$b and $5$a $5$b thank you

Feather Friends, Incorporated, distributes a high-quality wooden birdhouse that sells for $40 per unit. Variable expenses are $20.00 per unit, and fixed expenses total $160,000 per year. Its operating results for last year were as follows: Sales Variable expenses Contribution margin Fixed expenses Net operating income Required: 520, ooo 520, ooo 160, $ 360, Answer each question independently based on the original data: ces 1. What is the product's CM ratio? 2. Use the CM ratio to determine the break-even point in dollar sales. 3. Assume this year's unit sales and total sales increase by 50,000 units and $2,000,000, respectively. If the fixed expenses do not change, how much will net operating income increase? 4-a. What is the degree of operating leverage based on last year's sales? 4-b. Assume the president expects this year's unit sales to increase by 11%. Using the degree of operating leverage from last year, what percentage increase in net operating income will the company realize this year? 5. The sales manager is convinced that a 14% reduction in the selling price, combined with a $78,000 increase in advertising, would increase this year's unit sales by 25%. a. Ifthe sales manager is right, what would be this year's net operating income if his ideas are implemented? b. If the sales manager's ideas are implemented, how much will net operating income increase or decrease over last year? 6. The president does not want to change the selling price. Instead, he wants to increase the