-39.26% is the change from 647 to 393
Calculation steps:
[( 393 - 647 ) ÷ 647] x 100 = -39.26%
Formula
Percentage change = [(393 - 647) / 647] x 100
Subtract the new number by the original number
393 - 647 = -254
-254 ÷ 647 = -0.39258114374034003
-0.39258114374034003 x 100 = -39.26%