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Break even is when your [economic] profits equals to zero: \begin{align*} \text{Cost} &= \text{Revenue}\\ N \cdot w &= Q \cdot P \end{align*} where $N$ is the number of workers, $w$ is wages, $Q$ is quantity produced, and $P$ is price. An $x$% increase in productivity is the ability to hire the same amount of workers and get $x$% more output. ...