-57.14% is the change from 210 to 90
Calculation steps:
[( 90 - 210 ) ÷ 210] x 100 = -57.14%
Formula
Percentage change = [(90 - 210) / 210] x 100
Subtract the new number by the original number
90 - 210 = -120
-120 ÷ 210 = -0.5714285714285714
-0.5714285714285714 x 100 = -57.14%