-94.87% is the change from 390 to 20
Calculation steps:
[( 20 - 390 ) ÷ 390] x 100 = -94.87%
Formula
Percentage change = [(20 - 390) / 390] x 100
Subtract the new number by the original number
20 - 390 = -370
-370 ÷ 390 = -0.9487179487179487
-0.9487179487179487 x 100 = -94.87%