50% is the change from 38 to 57
Calculation steps:
[( 57 - 38 ) ÷ 38] x 100 = 50%
Formula
Percentage change = [(57 - 38) / 38] x 100
Subtract the new number by the original number
57 - 38 = 19
19 ÷ 38 = 0.5
0.5 x 100 = 50%
Example