-96.08% is the change from 306 to 12
Calculation steps:
[( 12 - 306 ) ÷ 306] x 100 = -96.08%
Formula
Percentage change = [(12 - 306) / 306] x 100
Subtract the new number by the original number
12 - 306 = -294
-294 ÷ 306 = -0.9607843137254902
-0.9607843137254902 x 100 = -96.08%