-0.83% is the change from 121 to 120
Calculation steps:
[( 120 - 121 ) ÷ 121] x 100 = -0.83%
Formula
Percentage change = [(120 - 121) / 121] x 100
Subtract the new number by the original number
120 - 121 = -1
-1 ÷ 121 = -0.008264462809917356
-0.008264462809917356 x 100 = -0.83%