-97.06% is the change from 306 to 9
Calculation steps:
[( 9 - 306 ) ÷ 306] x 100 = -97.06%
Formula
Percentage change = [(9 - 306) / 306] x 100
Subtract the new number by the original number
9 - 306 = -297
-297 ÷ 306 = -0.9705882352941176
-0.9705882352941176 x 100 = -97.06%