-88.71% is the change from 620 to 70
Calculation steps:
[( 70 - 620 ) ÷ 620] x 100 = -88.71%
Formula
Percentage change = [(70 - 620) / 620] x 100
Subtract the new number by the original number
70 - 620 = -550
-550 ÷ 620 = -0.8870967741935484
-0.8870967741935484 x 100 = -88.71%