Help!

$\frac{\pm 3}{150}*100 \\=\frac{\pm 300}{150} \\= \pm 2 \\~\\ 2 \hspace{1cm} \text{or} \hspace{1cm} -2$

Unless if you meant:

$\frac{\pm 3}{150*100} \\ = \frac{\pm 3}{15,000} \\ =\frac{\pm 1}{5,000} \\~\\ \frac{1}{5,000}\hspace{1cm}\text{or}\hspace{1cm} -\frac{1}{5,000}$