Answer the following independent questions and show computations using the contribution margin technique to support your answers. 1. How many units must be sold to break even? 2. What is the total sales that must be generated for the company to earn a profit of $60,000? 3. If the company is presently selling 45,000 units, but plans to spend an additional $108,000 on an advertising program, how many additional units must the company sell to earn the same net income it is now making