An additional payment or a saving?

The above answer is not currency dependent, whether you use US dollars, euros or other currencies.

Here is a quick calculation to find the percentage increase or decrease in an item price of $80 and the original price of $100. The procedure and video is as follows:

Step1

The need to be known

In the case above, the original price of the product is $100 and the current price is $80.

Step2

Calculate the price difference

The current price of the product is lower than the original price, product at $20.00

Step3

ratio changed

The difference is divided by the original price to give the difference as a percentage of the original price. Note that it is not divided by the current price, so the result is 20.00 / 100 = 0.20.

Step4

percentage changed

The conversion of a ratio of change to a percentage of change is a simple process of multiplying the ratio by 100, so the result will be 0.20 * 100 = 20.00%.

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Percentage Change Table between 100 to 200