-97.35% is the change from 339 to 9
Calculation steps:
[( 9 - 339 ) ÷ 339] x 100 = -97.35%
Formula
Percentage change = [(9 - 339) / 339] x 100
Subtract the new number by the original number
9 - 339 = -330
-330 ÷ 339 = -0.9734513274336283
-0.9734513274336283 x 100 = -97.35%