-63.4% is the change from 642 to 235
Calculation steps:
[( 235 - 642 ) ÷ 642] x 100 = -63.4%
Formula
Percentage change = [(235 - 642) / 642] x 100
Subtract the new number by the original number
235 - 642 = -407
-407 ÷ 642 = -0.6339563862928349
-0.6339563862928349 x 100 = -63.4%