-49.3% is the change from 641 to 325
Calculation steps:
[( 325 - 641 ) ÷ 641] x 100 = -49.3%
Formula
Percentage change = [(325 - 641) / 641] x 100
Subtract the new number by the original number
325 - 641 = -316
-316 ÷ 641 = -0.49297971918876754
-0.49297971918876754 x 100 = -49.3%