-42.86% is the change from 42 to 24
Calculation steps:
[( 24 - 42 ) ÷ 42] x 100 = -42.86%
Formula
Percentage change = [(24 - 42) / 42] x 100
Subtract the new number by the original number
24 - 42 = -18
-18 ÷ 42 = -0.42857142857142855
-0.42857142857142855 x 100 = -42.86%