-49.06% is the change from 638 to 325
Calculation steps:
[( 325 - 638 ) ÷ 638] x 100 = -49.06%
Formula
Percentage change = [(325 - 638) / 638] x 100
Subtract the new number by the original number
325 - 638 = -313
-313 ÷ 638 = -0.49059561128526646
-0.49059561128526646 x 100 = -49.06%