-13.55% is the change from 642 to 555
Calculation steps:
[( 555 - 642 ) ÷ 642] x 100 = -13.55%
Formula
Percentage change = [(555 - 642) / 642] x 100
Subtract the new number by the original number
555 - 642 = -87
-87 ÷ 642 = -0.13551401869158877
-0.13551401869158877 x 100 = -13.55%