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how to work out the reverse percentage. Convert Percentage to Decimal Divide the percentage added to the original by 100. In this example we are going to use a more abstract number and percent.
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This process is the reverse of what you did earlier. 3 We now have your ratio set up we now need to find out how much the original cost was or 100. 142500 is 95 of the unknown total.
Therefore the original number can be calculate as 1004400.
Change the percentage from Step 1 to decimal by moving two decimal places to the left. The answer would be wrong. If the percentage is an increase then add it to 100 if it is a decrease then subtract it from 100. For example if a tip 6 percent was added to the bill to make it 115 work out 15 100 015.
