Bunuel wrote:
The value of a concept coin is inversely proportional to its radius. If a coin was melted and smaller coins with radii 1/4th of the original coin and thickness same as that of the original coin were made(using all the metal of the original coin), what will the overall percentage increase in value after the operation?
A. 400%
B. 1500%
C. 1600%
D. 6300%
E. 6400%
Let the radius of original coin = r
Small coins of radius r/4 are formed from original coin with same thickness.
Let n be the number of
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