# The market bought grapes for $0.87 a pound and sold them for $1.09 a pound. What is the percent of increase rounded to the nearest tenth?

##### 1 Answer

Unless told otherwise the increase will be compared to the original value. So we are comparing to $0.87

Increase is the change which is

So expressed as a fraction the change is

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The percentage change is:

Rounded to the nearest tenth

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A percentage in fraction form is

So we need to change

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So we need to manipulate $0.87 this way:

To maintain the correct ratio what we do to the bottom we also do to the top.

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Multiply top and bottom by

giving

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In the same way that centimetre is the unit size of

So for example