If the radius of a right circular cylinder is decreased by \(10\%\) and the height is increased by \(20\%\), then the percentage increase/decrease in its volume is:
Decrease by 2.8%
Volume of a cylinder is proportional to r^2 h. New volume factor = (0.9)^2 * (1.2) = 0.81 * 1.2 = 0.972, i.e. 97.2% of the original volume, which is a decrease of 2.8%.
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