-12.28% is the change from 57 to 50
Calculation steps:
[( 50 - 57 ) ÷ 57] x 100 = -12.28%
Formula
Percentage change = [(50 - 57) / 57] x 100
Subtract the new number by the original number
50 - 57 = -7
-7 ÷ 57 = -0.12280701754385964
-0.12280701754385964 x 100 = -12.28%