The change from 210 to 180 in percentage represents a decrease of -1429 of 210. The variable b is the percent change in decimal form. How to calculate percentage change and percentage formula.
The formula for percentage change can be derived as the difference between the original value of the variable and the new value divided by its original value which is then expressed in percentage.
Positive percentage change is an increase and negative is a decrease. To calculate the percentage increase. To calculate the percentage of a total in Excel execute the following steps. For more general percentage calculations see our page Percentage Calculators.