-25.41% is the change from 850 to 634
Calculation steps:
[( 634 - 850 ) ÷ 850] x 100 = -25.41%
Formula
Percentage change = [(634 - 850) / 850] x 100
Subtract the new number by the original number
634 - 850 = -216
-216 ÷ 850 = -0.2541176470588235
-0.2541176470588235 x 100 = -25.41%