-44.87% is the change from 390 to 215
Calculation steps:
[( 215 - 390 ) ÷ 390] x 100 = -44.87%
Formula
Percentage change = [(215 - 390) / 390] x 100
Subtract the new number by the original number
215 - 390 = -175
-175 ÷ 390 = -0.44871794871794873
-0.44871794871794873 x 100 = -44.87%