-80.77% is the change from 390 to 75
Calculation steps:
[( 75 - 390 ) ÷ 390] x 100 = -80.77%
Formula
Percentage change = [(75 - 390) / 390] x 100
Subtract the new number by the original number
75 - 390 = -315
-315 ÷ 390 = -0.8076923076923077
-0.8076923076923077 x 100 = -80.77%