-4.82% is the change from 850 to 809
Calculation steps:
[( 809 - 850 ) ÷ 850] x 100 = -4.82%
Formula
Percentage change = [(809 - 850) / 850] x 100
Subtract the new number by the original number
809 - 850 = -41
-41 ÷ 850 = -0.04823529411764706
-0.04823529411764706 x 100 = -4.82%