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Since a percentage is just a way to express a number as a portion of 100, set up an equation. The percentage over 100 needs to equal the increase over the original number.

Let's say the price of gas increased from $2 to $3. The increase is 3 - 2 = 1. Put the increase over the original number and let x=the percentage:

1/2 = x/100

Multiply both sides of the equation by 100 to get xalone.

100/2 = x

100/2 = 50 = x, so the price of gas increased by 50%.

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Q: How do you calculate the increase in a number as a percentage?
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