Using reverse percentages is a way of working backwards on a percentages problem in order to find the original amount. Solving for x we get the above formula. Convert the opposite percent to a decimal.
Steo 3 Divide final number by decimal.
In order to do this we. Percentage change 20 - 16 16 This gives the result 025 or 25 This percentage calculation is shown in the Excel spreadsheet below. Examples of the Lehman Formula The original structure of the Lehman Formula is a 5-4-3-2-1 ladder as follows. 25 04 40.