-25.18% is the change from 421 to 315
Calculation steps:
[( 315 - 421 ) ÷ 421] x 100 = -25.18%
Formula
Percentage change = [(315 - 421) / 421] x 100
Subtract the new number by the original number
315 - 421 = -106
-106 ÷ 421 = -0.2517814726840855
-0.2517814726840855 x 100 = -25.18%