19.61% is the change from 51 to 61
Calculation steps:
[( 61 - 51 ) ÷ 51] x 100 = 19.61%
Formula
Percentage change = [(61 - 51) / 51] x 100
Subtract the new number by the original number
61 - 51 = 10
10 ÷ 51 = 0.19607843137254902
0.19607843137254902 x 100 = 19.61%