-53.18% is the change from 850 to 398
Calculation steps:
[( 398 - 850 ) ÷ 850] x 100 = -53.18%
Formula
Percentage change = [(398 - 850) / 850] x 100
Subtract the new number by the original number
398 - 850 = -452
-452 ÷ 850 = -0.5317647058823529
-0.5317647058823529 x 100 = -53.18%