-28.22% is the change from 900 to 646
Calculation steps:
[( 646 - 900 ) ÷ 900] x 100 = -28.22%
Formula
Percentage change = [(646 - 900) / 900] x 100
Subtract the new number by the original number
646 - 900 = -254
-254 ÷ 900 = -0.2822222222222222
-0.2822222222222222 x 100 = -28.22%