-5.06% is the change from 850 to 807
Calculation steps:
[( 807 - 850 ) ÷ 850] x 100 = -5.06%
Formula
Percentage change = [(807 - 850) / 850] x 100
Subtract the new number by the original number
807 - 850 = -43
-43 ÷ 850 = -0.05058823529411765
-0.05058823529411765 x 100 = -5.06%