-39.67% is the change from 421 to 254
Calculation steps:
[( 254 - 421 ) ÷ 421] x 100 = -39.67%
Formula
Percentage change = [(254 - 421) / 421] x 100
Subtract the new number by the original number
254 - 421 = -167
-167 ÷ 421 = -0.39667458432304037
-0.39667458432304037 x 100 = -39.67%