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A circular logo is enlarged to fit the lid of a jar. The new diameter is 50 per cent larger than the original. By what percentage has the area of the logo increased?
I don't know
If the diameter of the old lid is 100, the diameter of the new lid
will be 150.
This gives a ratio of 2 : 3
The areas of the lids will be in the ratio (2)2 : (3)2 . or 4 : 9
This represents an increase in area of 5units for every 4 units
5/4 is equivalent to 125 percent.