-78.19% is the change from 642 to 140
Calculation steps:
[( 140 - 642 ) ÷ 642] x 100 = -78.19%
Formula
Percentage change = [(140 - 642) / 642] x 100
Subtract the new number by the original number
140 - 642 = -502
-502 ÷ 642 = -0.7819314641744548
-0.7819314641744548 x 100 = -78.19%