-55.63% is the change from 879 to 390
Calculation steps:
[( 390 - 879 ) ÷ 879] x 100 = -55.63%
Formula
Percentage change = [(390 - 879) / 879] x 100
Subtract the new number by the original number
390 - 879 = -489
-489 ÷ 879 = -0.5563139931740614
-0.5563139931740614 x 100 = -55.63%