Explanation
$$100 \% \rightarrow 360 ^{\circ}\\ \therefore 1 \% \rightarrow (\dfrac{360}{100})^{\circ}\\ \therefore 10\% =36^{\circ}\\and \>36^{\circ}\rightarrow 20\> people \\\therefore 1^{\circ} \rightarrow (\dfrac{20}{36})\times 360 = 200\> people$$
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