Find the rate of increase (with respect to $r$) in the surface area ($S=4\pi r^2$) of a spherical balloon when:

(A) $r = 2$ inches $\rightarrow$ Rate of increase =

(B) $r = 3$ inches $\rightarrow$ Rate of increase =

(C) $r = 6$ inches $\rightarrow$ Rate of increase =

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