-12.37% is the change from 970 to 850
Calculation steps:
[( 850 - 970 ) ÷ 970] x 100 = -12.37%
Formula
Percentage change = [(850 - 970) / 970] x 100
Subtract the new number by the original number
850 - 970 = -120
-120 ÷ 970 = -0.12371134020618557
-0.12371134020618557 x 100 = -12.37%