If the radius of the base of a right circular cylinder is decreased by 20% and its height is increased by 134%, then what is the percentage increase (closest integer) in its volume?
A50%
B63%
C52%
D22%
A50%
B63%
C52%
D22%
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A square pyramid is cut, open and laid flat as in the figure below. What is the surface area of this pyramid ?