-28.09% is the change from 890 to 640
Calculation steps:
[( 640 - 890 ) ÷ 890] x 100 = -28.09%
Formula
Percentage change = [(640 - 890) / 890] x 100
Subtract the new number by the original number
640 - 890 = -250
-250 ÷ 890 = -0.2808988764044944
-0.2808988764044944 x 100 = -28.09%