-48.8% is the change from 668 to 342
Calculation steps:
[( 342 - 668 ) ÷ 668] x 100 = -48.8%
Formula
Percentage change = [(342 - 668) / 668] x 100
Subtract the new number by the original number
342 - 668 = -326
-326 ÷ 668 = -0.4880239520958084
-0.4880239520958084 x 100 = -48.8%