If the radius of a sphere is increased by \( 25 \% \), then find the percentage increase in its ...

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If the radius of a sphere is increased by \( 25 \% \), then find the percentage increase in its volume.
a. \( 84 \% \)
b. \( 95 \% \)
c. \( 83 \% \)
d. \( 195 \% \)
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