-20.05% is the change from 424 to 339
Calculation steps:
[( 339 - 424 ) ÷ 424] x 100 = -20.05%
Formula
Percentage change = [(339 - 424) / 424] x 100
Subtract the new number by the original number
339 - 424 = -85
-85 ÷ 424 = -0.20047169811320756
-0.20047169811320756 x 100 = -20.05%