-93.55% is the change from 620 to 40
Calculation steps:
[( 40 - 620 ) ÷ 620] x 100 = -93.55%
Formula
Percentage change = [(40 - 620) / 620] x 100
Subtract the new number by the original number
40 - 620 = -580
-580 ÷ 620 = -0.9354838709677419
-0.9354838709677419 x 100 = -93.55%