-68.42% is the change from 57 to 18
Calculation steps:
[( 18 - 57 ) ÷ 57] x 100 = -68.42%
Formula
Percentage change = [(18 - 57) / 57] x 100
Subtract the new number by the original number
18 - 57 = -39
-39 ÷ 57 = -0.6842105263157895
-0.6842105263157895 x 100 = -68.42%