-55.76% is the change from 642 to 284
Calculation steps:
[( 284 - 642 ) ÷ 642] x 100 = -55.76%
Formula
Percentage change = [(284 - 642) / 642] x 100
Subtract the new number by the original number
284 - 642 = -358
-358 ÷ 642 = -0.557632398753894
-0.557632398753894 x 100 = -55.76%