-49.61% is the change from 645 to 325
Calculation steps:
[( 325 - 645 ) ÷ 645] x 100 = -49.61%
Formula
Percentage change = [(325 - 645) / 645] x 100
Subtract the new number by the original number
325 - 645 = -320
-320 ÷ 645 = -0.49612403100775193
-0.49612403100775193 x 100 = -49.61%