-50.77% is the change from 390 to 192
Calculation steps:
[( 192 - 390 ) ÷ 390] x 100 = -50.77%
Formula
Percentage change = [(192 - 390) / 390] x 100
Subtract the new number by the original number
192 - 390 = -198
-198 ÷ 390 = -0.5076923076923077
-0.5076923076923077 x 100 = -50.77%