-22.37% is the change from 827 to 642
Calculation steps:
[( 642 - 827 ) ÷ 827] x 100 = -22.37%
Formula
Percentage change = [(642 - 827) / 827] x 100
Subtract the new number by the original number
642 - 827 = -185
-185 ÷ 827 = -0.22370012091898428
-0.22370012091898428 x 100 = -22.37%