-30.95% is the change from 420 to 290
Calculation steps:
[( 290 - 420 ) ÷ 420] x 100 = -30.95%
Formula
Percentage change = [(290 - 420) / 420] x 100
Subtract the new number by the original number
290 - 420 = -130
-130 ÷ 420 = -0.30952380952380953
-0.30952380952380953 x 100 = -30.95%