-20.67% is the change from 421 to 334
Calculation steps:
[( 334 - 421 ) ÷ 421] x 100 = -20.67%
Formula
Percentage change = [(334 - 421) / 421] x 100
Subtract the new number by the original number
334 - 421 = -87
-87 ÷ 421 = -0.20665083135391923
-0.20665083135391923 x 100 = -20.67%