-93.92% is the change from 641 to 39
Calculation steps:
[( 39 - 641 ) ÷ 641] x 100 = -93.92%
Formula
Percentage change = [(39 - 641) / 641] x 100
Subtract the new number by the original number
39 - 641 = -602
-602 ÷ 641 = -0.9391575663026521
-0.9391575663026521 x 100 = -93.92%