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Math·Geometry and Trigonometry·Area and volume

hard

	Volume (cubic units)
Right circular cylinder A	$392\pi$
Right circular cylinder B	$10,584\pi$

The table shows the volume of two similar solids, right circular cylinder A and right circular cylinder B. The radius of right circular cylinder A is $7$ units. The surface area of right circular cylinder A is $k\pi$ square units, and the surface area of right circular cylinder B is $n\pi$ square units, where $k$ and $n$ are constants. What is the value of $n-k$? (The surface area of a right circular cylinder with radius $r$ and height $h$ is $2\pi r^2+2\pi rh$.)

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1680