-95.77% is the change from 638 to 27
Calculation steps:
[( 27 - 638 ) ÷ 638] x 100 = -95.77%
Formula
Percentage change = [(27 - 638) / 638] x 100
Subtract the new number by the original number
27 - 638 = -611
-611 ÷ 638 = -0.957680250783699
-0.957680250783699 x 100 = -95.77%