-56.7% is the change from 642 to 278
Calculation steps:
[( 278 - 642 ) ÷ 642] x 100 = -56.7%
Formula
Percentage change = [(278 - 642) / 642] x 100
Subtract the new number by the original number
278 - 642 = -364
-364 ÷ 642 = -0.5669781931464174
-0.5669781931464174 x 100 = -56.7%