-39.88% is the change from 647 to 389
Calculation steps:
[( 389 - 647 ) ÷ 647] x 100 = -39.88%
Formula
Percentage change = [(389 - 647) / 647] x 100
Subtract the new number by the original number
389 - 647 = -258
-258 ÷ 647 = -0.3987635239567233
-0.3987635239567233 x 100 = -39.88%