-58% is the change from 100 to 42
Calculation steps:
[( 42 - 100 ) ÷ 100] x 100 = -58%
Formula
Percentage change = [(42 - 100) / 100] x 100
Subtract the new number by the original number
42 - 100 = -58
-58 ÷ 100 = -0.58
-0.58 x 100 = -58%
Example