-26.32% is the change from 57 to 42
Calculation steps:
[( 42 - 57 ) ÷ 57] x 100 = -26.32%
Formula
Percentage change = [(42 - 57) / 57] x 100
Subtract the new number by the original number
42 - 57 = -15
-15 ÷ 57 = -0.2631578947368421
-0.2631578947368421 x 100 = -26.32%