-27.89% is the change from 900 to 649
Calculation steps:
[( 649 - 900 ) ÷ 900] x 100 = -27.89%
Formula
Percentage change = [(649 - 900) / 900] x 100
Subtract the new number by the original number
649 - 900 = -251
-251 ÷ 900 = -0.2788888888888889
-0.2788888888888889 x 100 = -27.89%