Growth and Decay

Denote $O$ and $N$ the old value and new value respectively, $r\%$ the growth / decay rate.

1. Growth
   \begin{equation*}
   N=O(1+r\%)
   \end{equation*}

2. Decay
   \begin{equation*}
   N=O(1-r\%)
   \end{equation*}

Same Topic:

Identities of Squares Interests Percentage Changed Profit and Loss