# math

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In one year, the Dow Jones Industrial Average increased from 3,945 to 4,386. What percent increase does this represent to the nearest tenth of a percent?

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1%

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How did you get that? I got a much different answer.

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I divide 3945/4386=0.89, then I just rounded to 1%.

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Ah -- you forgot the subtraction part.

4,386 - 3,945 = 441

Now compare that difference with the original number.

441/3,945 = ?

We can prove an answer by reversing the procedure.

3,945 * 0.1 = 394.5

3,945 + 394.5 does not equal 4,386.

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