A circular logo is enlarged to fit the lid of a jar. The new diameter is 50 percent larger than the original. By what percentage has the area of the logo increased?
Solution
Correct Answer: Option D
The area goes up as the square of the diameter, so the new area is (1.5)^2 times the old area, = 2.25 times larger. But the question is about the increase. The increase is 125%
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