-30.83% is the change from 120 to 83
Calculation steps:
[( 83 - 120 ) ÷ 120] x 100 = -30.83%
Formula
Percentage change = [(83 - 120) / 120] x 100
Subtract the new number by the original number
83 - 120 = -37
-37 ÷ 120 = -0.30833333333333335
-0.30833333333333335 x 100 = -30.83%