-55.9% is the change from 390 to 172
Calculation steps:
[( 172 - 390 ) ÷ 390] x 100 = -55.9%
Formula
Percentage change = [(172 - 390) / 390] x 100
Subtract the new number by the original number
172 - 390 = -218
-218 ÷ 390 = -0.558974358974359
-0.558974358974359 x 100 = -55.9%