-97.94% is the change from 970 to 20
Calculation steps:
[( 20 - 970 ) ÷ 970] x 100 = -97.94%
Formula
Percentage change = [(20 - 970) / 970] x 100
Subtract the new number by the original number
20 - 970 = -950
-950 ÷ 970 = -0.979381443298969
-0.979381443298969 x 100 = -97.94%