-26.64% is the change from 642 to 471
Calculation steps:
[( 471 - 642 ) ÷ 642] x 100 = -26.64%
Formula
Percentage change = [(471 - 642) / 642] x 100
Subtract the new number by the original number
471 - 642 = -171
-171 ÷ 642 = -0.26635514018691586
-0.26635514018691586 x 100 = -26.64%