-96.26% is the change from 642 to 24
Calculation steps:
[( 24 - 642 ) ÷ 642] x 100 = -96.26%
Formula
Percentage change = [(24 - 642) / 642] x 100
Subtract the new number by the original number
24 - 642 = -618
-618 ÷ 642 = -0.9626168224299065
-0.9626168224299065 x 100 = -96.26%