Save Money - How to Calculate Percent Increase and Decrease

With gasoline price going up and down every single day, people often ask me how to calculate the percent increase and decrease of price.

In my article How to Make Your Money Grow we talked about how the price of gasoline can become substantially high if you compare Gas Station A with Gas Station B over a period of one year.

So I am going to take that example to demonstrate how you can calculate the percent increase and decrease for everything you want.

In our example, Gas Station A is selling unleaded gasoline at $3.399 a gallon and Gas Station B is selling gasoline at $3.199 a gallon.

Just looking at the price we can see that the difference is $0.20, but how about the percentage? How much more expensive is Gas Station A compared to Gas Station B?

How we calculate percent increase:

Gas Station A or just A: $3.399

Gas Station B or just B: $3.199

A - B = 0.20
0.20 / B = 0.06252
0.06252 * 100 = 6.252%
Always multiply the result number by 100 in order to get the %

A quicker way to do:

[(A - B) / B] * 100 = %
[(3.399 - 3.199) / 3.199] * 100 = 6.252%

It means that the unleaded gasoline at Gas Station A is 6.252% more expensive than Gas Station B.

If you want to check your result:

B * % + B = A
3.199 * 0.0625 + 3.199 = 3.399

A quicker way to do:

B * (1 + %) = A
3.199 * 1.0625 = 3.399

Remember: You multiple by 1.0625 and not 0.0625 so you won’t have to add to the original price again.

How to Calculate Percent Decrease

Now, how about if we want to know the percent decrease, or how much cheaper is Gas Station B compared to Gas Station A?

In that case, here is how we calculate:

Gas Station A or just A: $3.399

Gas Station B or just B: $3.199

B - A = -0.20
0.20 / A = 0.05884
or -5.884%

A quicker way to do:

[(B - A) / A] * 100 = %
[(3.199 - 3.399) / 3.399] * 100 = -5.884%

That means that unleaded gasoline at Gas Station B is 5.884% cheaper than Gas Station B.

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That’s it

You can calculate percent increase and decrease for everything you want.

Our main purpose here is to help you understand how it works and use it to calculate how much you are saving when you purchase a product.

Thanks for reading and best wishes to all… (READ -> 8 Habits to Be Happier)

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