-62.31% is the change from 642 to 242
Calculation steps:
[( 242 - 642 ) ÷ 642] x 100 = -62.31%
Formula
Percentage change = [(242 - 642) / 642] x 100
Subtract the new number by the original number
242 - 642 = -400
-400 ÷ 642 = -0.6230529595015576
-0.6230529595015576 x 100 = -62.31%