-59.97% is the change from 642 to 257
Calculation steps:
[( 257 - 642 ) ÷ 642] x 100 = -59.97%
Formula
Percentage change = [(257 - 642) / 642] x 100
Subtract the new number by the original number
257 - 642 = -385
-385 ÷ 642 = -0.5996884735202492
-0.5996884735202492 x 100 = -59.97%