-26.12% is the change from 869 to 642
Calculation steps:
[( 642 - 869 ) ÷ 869] x 100 = -26.12%
Formula
Percentage change = [(642 - 869) / 869] x 100
Subtract the new number by the original number
642 - 869 = -227
-227 ÷ 869 = -0.2612197928653625
-0.2612197928653625 x 100 = -26.12%