-76.96% is the change from 638 to 147
Calculation steps:
[( 147 - 638 ) ÷ 638] x 100 = -76.96%
Formula
Percentage change = [(147 - 638) / 638] x 100
Subtract the new number by the original number
147 - 638 = -491
-491 ÷ 638 = -0.7695924764890282
-0.7695924764890282 x 100 = -76.96%