-37.5% is the change from 672 to 420
Calculation steps:
[( 420 - 672 ) ÷ 672] x 100 = -37.5%
Formula
Percentage change = [(420 - 672) / 672] x 100
Subtract the new number by the original number
420 - 672 = -252
-252 ÷ 672 = -0.375
-0.375 x 100 = -37.5%