-80.65% is the change from 620 to 120
Calculation steps:
[( 120 - 620 ) ÷ 620] x 100 = -80.65%
Formula
Percentage change = [(120 - 620) / 620] x 100
Subtract the new number by the original number
120 - 620 = -500
-500 ÷ 620 = -0.8064516129032258
-0.8064516129032258 x 100 = -80.65%