-19.47% is the change from 642 to 517
Calculation steps:
[( 517 - 642 ) ÷ 642] x 100 = -19.47%
Formula
Percentage change = [(517 - 642) / 642] x 100
Subtract the new number by the original number
517 - 642 = -125
-125 ÷ 642 = -0.19470404984423675
-0.19470404984423675 x 100 = -19.47%