The company's sales and expenses for the last quarter were as follow: REQUIRED: 1. What are the company's contribution margin per unit and the contribution margin ratio? 2. What is the quarterly break-even point in units sold and in sales dollars? 3. Without resorting to computations, calculate the total contribution margin at the quarterly break-even point. 4. How many units should be sold each quarter to earn a target profit of $18000. Use the formula method. Verify your answer by preparing a contribution format of an income statement at the target sales level. 5. Refer to the oniginal data and compute the margin of safety for the quarter in dollar and in percentage. 6. If quarterly sales increase by $80000 and there is no changes in the fixed expenses, by how much would the operating income increase (do not prepare an income statement)