-27.08% is the change from 421 to 307
Calculation steps:
[( 307 - 421 ) ÷ 421] x 100 = -27.08%
Formula
Percentage change = [(307 - 421) / 421] x 100
Subtract the new number by the original number
307 - 421 = -114
-114 ÷ 421 = -0.27078384798099764
-0.27078384798099764 x 100 = -27.08%