-19.61% is the change from 51 to 41
Calculation steps:
[( 41 - 51 ) ÷ 51] x 100 = -19.61%
Formula
Percentage change = [(41 - 51) / 51] x 100
Subtract the new number by the original number
41 - 51 = -10
-10 ÷ 51 = -0.19607843137254902
-0.19607843137254902 x 100 = -19.61%