Assist with questions and provide a reference when possible.

1. How is the break-even equation modified to take into account the sales required to earn a desired profit?
2. How does a profit volume graph differ from a cost volume profit graph?
3. When is a profit volume graph most likely to be used?
4. What impact do income taxes have on the sales volume required to earn a desired after tax profit
5. What is the contribution margin ratio and when is it most useful