-28.01% is the change from 889 to 640
Calculation steps:
[( 640 - 889 ) ÷ 889] x 100 = -28.01%
Formula
Percentage change = [(640 - 889) / 889] x 100
Subtract the new number by the original number
640 - 889 = -249
-249 ÷ 889 = -0.28008998875140606
-0.28008998875140606 x 100 = -28.01%