-99.65% is the change from 850 to 3
Calculation steps:
[( 3 - 850 ) ÷ 850] x 100 = -99.65%
Formula
Percentage change = [(3 - 850) / 850] x 100
Subtract the new number by the original number
3 - 850 = -847
-847 ÷ 850 = -0.9964705882352941
-0.9964705882352941 x 100 = -99.65%