#### Explanation:

To find half of anything we just divide the quantity by $2$ or multiply it by $\frac{1}{2}$

So

$\frac{22.77}{2}$ OR $22.77 \times \frac{1}{2}$

Will yield...

$11.385$

But since we are talking about money, one could say that this is about $11.38 or $11.39 depending on how you want to round it.