-78.74% is the change from 668 to 142
Calculation steps:
[( 142 - 668 ) ÷ 668] x 100 = -78.74%
Formula
Percentage change = [(142 - 668) / 668] x 100
Subtract the new number by the original number
142 - 668 = -526
-526 ÷ 668 = -0.7874251497005988
-0.7874251497005988 x 100 = -78.74%