-49.85% is the change from 646 to 324
Calculation steps:
[( 324 - 646 ) ÷ 646] x 100 = -49.85%
Formula
Percentage change = [(324 - 646) / 646] x 100
Subtract the new number by the original number
324 - 646 = -322
-322 ÷ 646 = -0.4984520123839009
-0.4984520123839009 x 100 = -49.85%