-25.08% is the change from 638 to 478
Calculation steps:
[( 478 - 638 ) ÷ 638] x 100 = -25.08%
Formula
Percentage change = [(478 - 638) / 638] x 100
Subtract the new number by the original number
478 - 638 = -160
-160 ÷ 638 = -0.2507836990595611
-0.2507836990595611 x 100 = -25.08%