-81.79% is the change from 390 to 71
Calculation steps:
[( 71 - 390 ) ÷ 390] x 100 = -81.79%
Formula
Percentage change = [(71 - 390) / 390] x 100
Subtract the new number by the original number
71 - 390 = -319
-319 ÷ 390 = -0.8179487179487179
-0.8179487179487179 x 100 = -81.79%