-49.61% is the change from 635 to 320
Calculation steps:
[( 320 - 635 ) ÷ 635] x 100 = -49.61%
Formula
Percentage change = [(320 - 635) / 635] x 100
Subtract the new number by the original number
320 - 635 = -315
-315 ÷ 635 = -0.49606299212598426
-0.49606299212598426 x 100 = -49.61%