-53.29% is the change from 850 to 397
Calculation steps:
[( 397 - 850 ) ÷ 850] x 100 = -53.29%
Formula
Percentage change = [(397 - 850) / 850] x 100
Subtract the new number by the original number
397 - 850 = -453
-453 ÷ 850 = -0.5329411764705883
-0.5329411764705883 x 100 = -53.29%