To convert a decimal number to a percentage Dan will need to multiply it by 100 because percent of change is a comparison between two values expressed in hundredths. Percentage Actual Value Total Value 100 Some other important percentage formula of percentage change are. Fire up Excel and give it a try.
The percentage formula is.
The formula for calculating change is new value old value old value. Then divide that result by the old value. So divide by the old value and make it a percentage. The percentage change can be calculated to find out the profit or loss an item has made.