-89.69% is the change from 970 to 100
Calculation steps:
[( 100 - 970 ) ÷ 970] x 100 = -89.69%
Formula
Percentage change = [(100 - 970) / 970] x 100
Subtract the new number by the original number
100 - 970 = -870
-870 ÷ 970 = -0.8969072164948454
-0.8969072164948454 x 100 = -89.69%