-53.85% is the change from 390 to 180
Calculation steps:
[( 180 - 390 ) ÷ 390] x 100 = -53.85%
Formula
Percentage change = [(180 - 390) / 390] x 100
Subtract the new number by the original number
180 - 390 = -210
-210 ÷ 390 = -0.5384615384615384
-0.5384615384615384 x 100 = -53.85%