percentage
2009-08-04 10:13 pm
When a number is increased by x%(x isn't=0),and then decreased by x%,explain why the result is not equal to the original number.
回答 (1)
2009-08-04 10:30 pm
✔ 最佳答案
Let the number be a and increases by x%, it becomes a(1 + x%). It is then decreased by x%, the new value becomes a(1 + x%)(1 - x%)= a[1 + x% - x% - (x%)^2] = a[1 - (x%)^2] which is not equal to a.
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