The table below shows the relative investment energy sources in the united states by type one column shows the relative investment in 2010 of $\$75$ million total invested in alternative energy. The other column show the projected relative investment in 2018 given current trends. The total projected investment in alternative energy in 2018 is $ \$ 250$ million. <br> United states investment in Alternative Energy Sources

Question

QUESTION : By how much is the dollar amount invested in fuel cells in 2010 increased in 2018 ?

$\begin{array}{1 1} (a)\;\$ 8.5 \; million \\ (b)\; \$ 7.5 \; million \\ (c)\;\$6.5 \; million \\ (d)\; \$ 9.5 \; million \end{array}$