-19.81% is the change from 424 to 340
Calculation steps:
[( 340 - 424 ) ÷ 424] x 100 = -19.81%
Formula
Percentage change = [(340 - 424) / 424] x 100
Subtract the new number by the original number
340 - 424 = -84
-84 ÷ 424 = -0.19811320754716982
-0.19811320754716982 x 100 = -19.81%