-38.6% is the change from 684 to 420
Calculation steps:
[( 420 - 684 ) ÷ 684] x 100 = -38.6%
Formula
Percentage change = [(420 - 684) / 684] x 100
Subtract the new number by the original number
420 - 684 = -264
-264 ÷ 684 = -0.38596491228070173
-0.38596491228070173 x 100 = -38.6%