Answer
$\mathrm{The\ cost\ of\ removing} \ 95\%\ \mathrm{of\ pollutant\ is} \ \$127,300$.
Work Step by Step
$\begin{array}{l}
\mathrm{To\ find\ the\ cost\ of\ removing\ 95\%\ of\ pollutant\ from\ the\ environment,\ set\ } x\mathrm{\ equal\ to\ 95}\\
(\mathrm{recall\ that\ the\ units\ of} \ x\ \mathrm{is\ thousands\ of\ dollars}) \ \mathrm{then} \ \mathrm{apply\ the\ cost-benefit\ model\ }\\
\mathrm{as\ follows} :\\
\begin{array}{ l l }
y & =\dfrac{6.7( 95)}{100-95}\\
& \\
& =\dfrac{636.5}{5}\\
& \\
& =127.30
\end{array}\\
\\
\mathrm{The\ cost\ of\ removing} \ 95\%\ \mathrm{of\ pollutant\ is} \ \$127,300
\end{array}$.
