-98.39% is the change from 620 to 10
Calculation steps:
[( 10 - 620 ) ÷ 620] x 100 = -98.39%
Formula
Percentage change = [(10 - 620) / 620] x 100
Subtract the new number by the original number
10 - 620 = -610
-610 ÷ 620 = -0.9838709677419355
-0.9838709677419355 x 100 = -98.39%