A balloon which always remains spherical has a P variable radius. T...

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A balloon which always remains spherical has a
P
variable radius. The rate at which its volume is
W
increasing is \( k \mathrm{~cm}^{2} \) with the radius when the later is \( 7 \mathrm{~cm} \). Find \( k \).
(1) \( k=616 \)
(2) \( k=516 \)
(3) \( k=56 \)
(4) \( k=556 \)
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