-91.28% is the change from 390 to 34
Calculation steps:
[( 34 - 390 ) ÷ 390] x 100 = -91.28%
Formula
Percentage change = [(34 - 390) / 390] x 100
Subtract the new number by the original number
34 - 390 = -356
-356 ÷ 390 = -0.9128205128205128
-0.9128205128205128 x 100 = -91.28%