-95.06% is the change from 850 to 42
Calculation steps:
[( 42 - 850 ) ÷ 850] x 100 = -95.06%
Formula
Percentage change = [(42 - 850) / 850] x 100
Subtract the new number by the original number
42 - 850 = -808
-808 ÷ 850 = -0.9505882352941176
-0.9505882352941176 x 100 = -95.06%