-49.84% is the change from 642 to 322
Calculation steps:
[( 322 - 642 ) ÷ 642] x 100 = -49.84%
Formula
Percentage change = [(322 - 642) / 642] x 100
Subtract the new number by the original number
322 - 642 = -320
-320 ÷ 642 = -0.4984423676012461
-0.4984423676012461 x 100 = -49.84%