please help answer A-G including the table

12-18The Sheldon Company prepared the following contribution format income statement based on a sales volume of 1,000 units (the relevant range of production is 500 units to 1,500 units): (Treat each question with the original data.) SHOW ALL YOUR WORK A. Complete the above table so you can easily do the analysis B. C. If sales increase 1 unit, how much would Net Income increase? D. If sales increase by 250 units, variable expenses by $1 and advertising by $1500, what would the net operating income? E. How many units must be sold to achieve a target profit of 55000 ? F. What is the Margin of Safety in dollars? What is the Margin of safety percentage? G.What is the degree of operating leverage? Using that degree of leverage what would be the increase in Net Operating Income if sales increase 5%