-7.71% is the change from 921 to 850
Calculation steps:
[( 850 - 921 ) ÷ 921] x 100 = -7.71%
Formula
Percentage change = [(850 - 921) / 921] x 100
Subtract the new number by the original number
850 - 921 = -71
-71 ÷ 921 = -0.07709011943539631
-0.07709011943539631 x 100 = -7.71%