-49.61% is the change from 647 to 326
Calculation steps:
[( 326 - 647 ) ÷ 647] x 100 = -49.61%
Formula
Percentage change = [(326 - 647) / 647] x 100
Subtract the new number by the original number
326 - 647 = -321
-321 ÷ 647 = -0.49613601236476046
-0.49613601236476046 x 100 = -49.61%