-38.64% is the change from 647 to 397
Calculation steps:
[( 397 - 647 ) ÷ 647] x 100 = -38.64%
Formula
Percentage change = [(397 - 647) / 647] x 100
Subtract the new number by the original number
397 - 647 = -250
-250 ÷ 647 = -0.38639876352395675
-0.38639876352395675 x 100 = -38.64%