-49.14% is the change from 641 to 326
Calculation steps:
[( 326 - 641 ) ÷ 641] x 100 = -49.14%
Formula
Percentage change = [(326 - 641) / 641] x 100
Subtract the new number by the original number
326 - 641 = -315
-315 ÷ 641 = -0.4914196567862715
-0.4914196567862715 x 100 = -49.14%