TeX source:

\begin{array}{l} =\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{array}