-52.65% is the change from 642 to 304
Calculation steps:
[( 304 - 642 ) ÷ 642] x 100 = -52.65%
Formula
Percentage change = [(304 - 642) / 642] x 100
Subtract the new number by the original number
304 - 642 = -338
-338 ÷ 642 = -0.5264797507788161
-0.5264797507788161 x 100 = -52.65%