This document discusses break even analysis, which examines the relationship between changes in volume, total sales revenue, expenses, and net profit. It is also known as cost-volume-profit (CVP) analysis. Break even analysis is an important short-term planning and decision making tool. It can be used to determine the break even point, or number of units that must be sold to cover fixed costs. The margin of safety and contribution per unit are also key concepts. The document provides examples to demonstrate how to calculate the break even point and sales level required to generate a target profit using the break even formula and contribution per unit.