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Example 1: Increase 300 by 20%
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Solution

In questions like this, always remember that the original quantity is 100% of
itself. I will explain this with two approaches.
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1st Method
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Increasing 300 by 20% means adding 20% of 300 to itself. Got it?
Increase is 20% of 300
Therefore,
Increase = 20% * 300
= 0.2 * 300
= 60
The new number = 300 + 60
= 360

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2nd Method
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Since 300 is 100% of itself, increasing it by 20% means getting a number which is 100% + 20% of 300.
That is, the new number is 120% of 300.
Therefore;
New number = 120% of 300
= 1.2 * 300
= 360
Master this second method very well because it is economical; its saves time. Got it? Great!

To continue reading and to take a Simple COMPUTER BASED TEST on this lesson click here: http://samimath.com/decreased-increased-percentage-expained/

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