-28.35% is the change from 850 to 609
Calculation steps:
[( 609 - 850 ) ÷ 850] x 100 = -28.35%
Formula
Percentage change = [(609 - 850) / 850] x 100
Subtract the new number by the original number
609 - 850 = -241
-241 ÷ 850 = -0.28352941176470586
-0.28352941176470586 x 100 = -28.35%