-52.26% is the change from 641 to 306
Calculation steps:
[( 306 - 641 ) ÷ 641] x 100 = -52.26%
Formula
Percentage change = [(306 - 641) / 641] x 100
Subtract the new number by the original number
306 - 641 = -335
-335 ÷ 641 = -0.5226209048361935
-0.5226209048361935 x 100 = -52.26%