Given the Information in the Table Below,calculate (A)the Concentration Ratio;and

Essay

Given the information in the table below,calculate (a)the concentration ratio;and (b)the Herfindahl-Hirschman index.
$\begin{array}{cc}\text { Percent of }\\\text { Firm } & \text { Sales } \\\mathrm{A} & 20 \\\mathrm{~B} & 20 \\\mathrm{C} & 17 \\\mathrm{D} & 14 \\\mathrm{E} & 11 \\\mathrm{~F} & 7 \\\mathrm{G} & 6 \\\mathrm{H} & 3 \\\mathrm{I} & \underline{2}\\&100\%\end{array}$