Spherical Balloon Related Rates

A spherical balloon is being inflated so that its volume increases at a constant rate of 36π cubic inches per minute. At what rate, in square inches per minute, is the surface area of the balloon increasing when the radius is 6 inches? (The volume of a sphere of radius $r$ is $V = \displaystyle\frac{4}{3}\pi r^3$ and the surface area is $A = 4\pi r^2$.)