-86.21% is the change from 638 to 88
Calculation steps:
[( 88 - 638 ) ÷ 638] x 100 = -86.21%
Formula
Percentage change = [(88 - 638) / 638] x 100
Subtract the new number by the original number
88 - 638 = -550
-550 ÷ 638 = -0.8620689655172413
-0.8620689655172413 x 100 = -86.21%