-26% is the change from 850 to 629
Calculation steps:
[( 629 - 850 ) ÷ 850] x 100 = -26%
Formula
Percentage change = [(629 - 850) / 850] x 100
Subtract the new number by the original number
629 - 850 = -221
-221 ÷ 850 = -0.26
-0.26 x 100 = -26%
Example