58.82% is the change from 51 to 81
Calculation steps:
[( 81 - 51 ) ÷ 51] x 100 = 58.82%
Formula
Percentage change = [(81 - 51) / 51] x 100
Subtract the new number by the original number
81 - 51 = 30
30 ÷ 51 = 0.5882352941176471
0.5882352941176471 x 100 = 58.82%