-52.38% is the change from 672 to 320
Calculation steps:
[( 320 - 672 ) ÷ 672] x 100 = -52.38%
Formula
Percentage change = [(320 - 672) / 672] x 100
Subtract the new number by the original number
320 - 672 = -352
-352 ÷ 672 = -0.5238095238095238
-0.5238095238095238 x 100 = -52.38%