-49.07% is the change from 642 to 327
Calculation steps:
[( 327 - 642 ) ÷ 642] x 100 = -49.07%
Formula
Percentage change = [(327 - 642) / 642] x 100
Subtract the new number by the original number
327 - 642 = -315
-315 ÷ 642 = -0.49065420560747663
-0.49065420560747663 x 100 = -49.07%