-30.71% is the change from 420 to 291
Calculation steps:
[( 291 - 420 ) ÷ 420] x 100 = -30.71%
Formula
Percentage change = [(291 - 420) / 420] x 100
Subtract the new number by the original number
291 - 420 = -129
-129 ÷ 420 = -0.30714285714285716
-0.30714285714285716 x 100 = -30.71%