4. Company manufactures and sells desks. Each desk sells for 120,- fixed costs are 100 000,- and variable costs are 30,- per desk. a) What is the firm's operating income on sales of 3000 desks? b) Calculate company's breakeven point in sales units c) If the cost of material increases so that variable costs are now 35,- per desk, what will be new breakeven point? d) Considering the increase in variable costs, by how much will need to increase the selling price per desk to reach the original operating income for sales of 3000 desks calculated in part a