-22.25% is the change from 827 to 643
Calculation steps:
[( 643 - 827 ) ÷ 827] x 100 = -22.25%
Formula
Percentage change = [(643 - 827) / 827] x 100
Subtract the new number by the original number
643 - 827 = -184
-184 ÷ 827 = -0.22249093107617895
-0.22249093107617895 x 100 = -22.25%