-25.18% is the change from 850 to 636
Calculation steps:
[( 636 - 850 ) ÷ 850] x 100 = -25.18%
Formula
Percentage change = [(636 - 850) / 850] x 100
Subtract the new number by the original number
636 - 850 = -214
-214 ÷ 850 = -0.25176470588235295
-0.25176470588235295 x 100 = -25.18%