What is the rate of increase in the volume V? [S= 4pir^2 and V=4/3pir^3]

47. The radius r of a spherical weather balloon is increasing at the uniform rate of 0.4 inch per minute. At the instant when the surface area S becomes 100m square inches, what is the rate of increase in the volume V? |S = 4mr2 and V = 4 mr3| Include appropriate units