-52.49% is the change from 642 to 305
Calculation steps:
[( 305 - 642 ) ÷ 642] x 100 = -52.49%
Formula
Percentage change = [(305 - 642) / 642] x 100
Subtract the new number by the original number
305 - 642 = -337
-337 ÷ 642 = -0.5249221183800623
-0.5249221183800623 x 100 = -52.49%