-41.12% is the change from 642 to 378
Calculation steps:
[( 378 - 642 ) ÷ 642] x 100 = -41.12%
Formula
Percentage change = [(378 - 642) / 642] x 100
Subtract the new number by the original number
378 - 642 = -264
-264 ÷ 642 = -0.411214953271028
-0.411214953271028 x 100 = -41.12%