-75.18% is the change from 850 to 211
Calculation steps:
[( 211 - 850 ) ÷ 850] x 100 = -75.18%
Formula
Percentage change = [(211 - 850) / 850] x 100
Subtract the new number by the original number
211 - 850 = -639
-639 ÷ 850 = -0.7517647058823529
-0.7517647058823529 x 100 = -75.18%