TeX source:

\begin{aligned}& =\frac{-600,000 /[(24 \text { million }+24.6 \text { million }) / 2]}{\$ 6 /[(\$ 10+\$ 16) / 2]} \\& =\frac{-600,000 / 24.3 \text { million }}{\$ 6 / \$ 13} \\& =\frac{-0.025}{0.46} \\& =-0.05\end{aligned}