-77.74% is the change from 638 to 142
Calculation steps:
[( 142 - 638 ) ÷ 638] x 100 = -77.74%
Formula
Percentage change = [(142 - 638) / 638] x 100
Subtract the new number by the original number
142 - 638 = -496
-496 ÷ 638 = -0.7774294670846394
-0.7774294670846394 x 100 = -77.74%