-29.82% is the change from 57 to 40
Calculation steps:
[( 40 - 57 ) ÷ 57] x 100 = -29.82%
Formula
Percentage change = [(40 - 57) / 57] x 100
Subtract the new number by the original number
40 - 57 = -17
-17 ÷ 57 = -0.2982456140350877
-0.2982456140350877 x 100 = -29.82%