If real GDP increases from$$ $$5$ billion to$$ $$5\mathrm{.}25$ billion and the population increases from $2$ million to $2\mathrm{.}02$ million, real GDP per person increases by$\_\_\_\_\_\_$ percent.

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Part $1$

A$.$

$4\mathrm{.}0$

B$.$

$2\mathrm{.}5$

C$.$

$1\mathrm{.}0$

D$.$

$5\mathrm{.}0$