-49.77% is the change from 641 to 322
Calculation steps:
[( 322 - 641 ) ÷ 641] x 100 = -49.77%
Formula
Percentage change = [(322 - 641) / 641] x 100
Subtract the new number by the original number
322 - 641 = -319
-319 ÷ 641 = -0.49765990639625585
-0.49765990639625585 x 100 = -49.77%