-25.55% is the change from 642 to 478
Calculation steps:
[( 478 - 642 ) ÷ 642] x 100 = -25.55%
Formula
Percentage change = [(478 - 642) / 642] x 100
Subtract the new number by the original number
478 - 642 = -164
-164 ÷ 642 = -0.2554517133956386
-0.2554517133956386 x 100 = -25.55%