-77.88% is the change from 642 to 142
Calculation steps:
[( 142 - 642 ) ÷ 642] x 100 = -77.88%
Formula
Percentage change = [(142 - 642) / 642] x 100
Subtract the new number by the original number
142 - 642 = -500
-500 ÷ 642 = -0.778816199376947
-0.778816199376947 x 100 = -77.88%