-53.76% is the change from 850 to 393
Calculation steps:
[( 393 - 850 ) ÷ 850] x 100 = -53.76%
Formula
Percentage change = [(393 - 850) / 850] x 100
Subtract the new number by the original number
393 - 850 = -457
-457 ÷ 850 = -0.5376470588235294
-0.5376470588235294 x 100 = -53.76%