-5.29% is the change from 850 to 805
Calculation steps:
[( 805 - 850 ) ÷ 850] x 100 = -5.29%
Formula
Percentage change = [(805 - 850) / 850] x 100
Subtract the new number by the original number
805 - 850 = -45
-45 ÷ 850 = -0.052941176470588235
-0.052941176470588235 x 100 = -5.29%