-77.92% is the change from 643 to 142
Calculation steps:
[( 142 - 643 ) ÷ 643] x 100 = -77.92%
Formula
Percentage change = [(142 - 643) / 643] x 100
Subtract the new number by the original number
142 - 643 = -501
-501 ÷ 643 = -0.7791601866251944
-0.7791601866251944 x 100 = -77.92%