| $$ \begin{aligned}(\frac{100+r}{100})^{10}\cdot10-10& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}((\frac{100+r}{100})^{10}-1)\cdot10\end{aligned} $$ | |
| ① | Use the distributive property. |