-38.85% is the change from 641 to 392
Calculation steps:
[( 392 - 641 ) ÷ 641] x 100 = -38.85%
Formula
Percentage change = [(392 - 641) / 641] x 100
Subtract the new number by the original number
392 - 641 = -249
-249 ÷ 641 = -0.38845553822152884
-0.38845553822152884 x 100 = -38.85%