The Gini index, given by $201($x$$f$($x$))$dx$,$ is a measure of a country's income equality on a scale of $0($perfectly equal$)$ to $1($perfectly unequal$).$ If a country has f$($x$)=$x$5\mathrm{.}3,$ which expression represents the value of their Gini Index.

Group of answer choices

$2(1216\mathrm{.}3)$

$2(125\mathrm{.}3)$

$2(1215\mathrm{.}3)$

$116\mathrm{.}3$

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