The lateral surface area of a cylinder varies jointly as the radius and the height. If the height is increased by $20 \%$ and the radius is increased by $40 \%$, by what percent does the lateral surface area increase?

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The Answer of The lateral surface area of a cylinder varies jointly as the radius and the height. If the height is increased by $20 \%$ and the radius is increased by $40 \%$, by what percent does the lateral surface area increase?

The Lateral Surface Area of a Cylinder Varies Jointly as the Radius