-78.46% is the change from 390 to 84
Calculation steps:
[( 84 - 390 ) ÷ 390] x 100 = -78.46%
Formula
Percentage change = [(84 - 390) / 390] x 100
Subtract the new number by the original number
84 - 390 = -306
-306 ÷ 390 = -0.7846153846153846
-0.7846153846153846 x 100 = -78.46%