-42.86% is the change from 210 to 120
Calculation steps:
[( 120 - 210 ) ÷ 210] x 100 = -42.86%
Formula
Percentage change = [(120 - 210) / 210] x 100
Subtract the new number by the original number
120 - 210 = -90
-90 ÷ 210 = -0.42857142857142855
-0.42857142857142855 x 100 = -42.86%