-68.12% is the change from 850 to 271
Calculation steps:
[( 271 - 850 ) ÷ 850] x 100 = -68.12%
Formula
Percentage change = [(271 - 850) / 850] x 100
Subtract the new number by the original number
271 - 850 = -579
-579 ÷ 850 = -0.6811764705882353
-0.6811764705882353 x 100 = -68.12%