-83.33% is the change from 120 to 20
Calculation steps:
[( 20 - 120 ) ÷ 120] x 100 = -83.33%
Formula
Percentage change = [(20 - 120) / 120] x 100
Subtract the new number by the original number
20 - 120 = -100
-100 ÷ 120 = -0.8333333333333334
-0.8333333333333334 x 100 = -83.33%