Simon's most recent income statement is given below. Sales (8,000 units) $160,000 Less variable expenses (68,000) Contribution margin 92,000 Less fixed expenses (50,000) Net income $42,000 Required: a. Contribution margin per unit is b. If sales are doubled total variable costs will equal c. If sales are doubled total fixed costs will equal d. If 20 more units are sold, profits will increase by e. Compute how many units must be sold to break even. f. Compute how many units must be sold to achieve operating income of $60,000. g. Compute the revenue needed to achieve an after tax income of $30,000 given a tax rate of 30%.