-22.12% is the change from 642 to 500
Calculation steps:
[( 500 - 642 ) ÷ 642] x 100 = -22.12%
Formula
Percentage change = [(500 - 642) / 642] x 100
Subtract the new number by the original number
500 - 642 = -142
-142 ÷ 642 = -0.22118380062305296
-0.22118380062305296 x 100 = -22.12%