-1.06% is the change from 850 to 841
Calculation steps:
[( 841 - 850 ) ÷ 850] x 100 = -1.06%
Formula
Percentage change = [(841 - 850) / 850] x 100
Subtract the new number by the original number
841 - 850 = -9
-9 ÷ 850 = -0.010588235294117647
-0.010588235294117647 x 100 = -1.06%