-22.9% is the change from 642 to 495
Calculation steps:
[( 495 - 642 ) ÷ 642] x 100 = -22.9%
Formula
Percentage change = [(495 - 642) / 642] x 100
Subtract the new number by the original number
495 - 642 = -147
-147 ÷ 642 = -0.22897196261682243
-0.22897196261682243 x 100 = -22.9%