-42.21% is the change from 642 to 371
Calculation steps:
[( 371 - 642 ) ÷ 642] x 100 = -42.21%
Formula
Percentage change = [(371 - 642) / 642] x 100
Subtract the new number by the original number
371 - 642 = -271
-271 ÷ 642 = -0.4221183800623053
-0.4221183800623053 x 100 = -42.21%