-57.14% is the change from 42 to 18
Calculation steps:
[( 18 - 42 ) ÷ 42] x 100 = -57.14%
Formula
Percentage change = [(18 - 42) / 42] x 100
Subtract the new number by the original number
18 - 42 = -24
-24 ÷ 42 = -0.5714285714285714
-0.5714285714285714 x 100 = -57.14%