-24.52% is the change from 840 to 634
Calculation steps:
[( 634 - 840 ) ÷ 840] x 100 = -24.52%
Formula
Percentage change = [(634 - 840) / 840] x 100
Subtract the new number by the original number
634 - 840 = -206
-206 ÷ 840 = -0.24523809523809523
-0.24523809523809523 x 100 = -24.52%