Answer
$$\color{blue}{26.1\text{%; close to the actual amount}}$$
Work Step by Step
To find the midpoint $M(x,y)$ when given the endpoints $(21.3)$ and $(30.9)$ we will use the midpoint formula:
$${(\frac{x_{a}+x_{b}}{2},\frac{y_{a}+y_{b}}{2})}=M$$
$$\frac{21.3+30.9}{2}=M$$
$$\color{blue}{26.1\text{%; close to the actual amount}}$$
