-78.23% is the change from 620 to 135
Calculation steps:
[( 135 - 620 ) ÷ 620] x 100 = -78.23%
Formula
Percentage change = [(135 - 620) / 620] x 100
Subtract the new number by the original number
135 - 620 = -485
-485 ÷ 620 = -0.782258064516129
-0.782258064516129 x 100 = -78.23%