-97.83% is the change from 415 to 9
Calculation steps:
[( 9 - 415 ) ÷ 415] x 100 = -97.83%
Formula
Percentage change = [(9 - 415) / 415] x 100
Subtract the new number by the original number
9 - 415 = -406
-406 ÷ 415 = -0.9783132530120482
-0.9783132530120482 x 100 = -97.83%