-97.7% is the change from 392 to 9
Calculation steps:
[( 9 - 392 ) ÷ 392] x 100 = -97.7%
Formula
Percentage change = [(9 - 392) / 392] x 100
Subtract the new number by the original number
9 - 392 = -383
-383 ÷ 392 = -0.9770408163265306
-0.9770408163265306 x 100 = -97.7%