42.11% is the change from 57 to 81
Calculation steps:
[( 81 - 57 ) ÷ 57] x 100 = 42.11%
Formula
Percentage change = [(81 - 57) / 57] x 100
Subtract the new number by the original number
81 - 57 = 24
24 ÷ 57 = 0.42105263157894735
0.42105263157894735 x 100 = 42.11%