-82.42% is the change from 620 to 109
Calculation steps:
[( 109 - 620 ) ÷ 620] x 100 = -82.42%
Formula
Percentage change = [(109 - 620) / 620] x 100
Subtract the new number by the original number
109 - 620 = -511
-511 ÷ 620 = -0.8241935483870968
-0.8241935483870968 x 100 = -82.42%