-72.35% is the change from 850 to 235
Calculation steps:
[( 235 - 850 ) ÷ 850] x 100 = -72.35%
Formula
Percentage change = [(235 - 850) / 850] x 100
Subtract the new number by the original number
235 - 850 = -615
-615 ÷ 850 = -0.7235294117647059
-0.7235294117647059 x 100 = -72.35%