-53.33% is the change from 90 to 42
Calculation steps:
[( 42 - 90 ) ÷ 90] x 100 = -53.33%
Formula
Percentage change = [(42 - 90) / 90] x 100
Subtract the new number by the original number
42 - 90 = -48
-48 ÷ 90 = -0.5333333333333333
-0.5333333333333333 x 100 = -53.33%