-56.54% is the change from 642 to 279
Calculation steps:
[( 279 - 642 ) ÷ 642] x 100 = -56.54%
Formula
Percentage change = [(279 - 642) / 642] x 100
Subtract the new number by the original number
279 - 642 = -363
-363 ÷ 642 = -0.5654205607476636
-0.5654205607476636 x 100 = -56.54%