Answer:
Total Cost = 14.50
Explanation:
We have to assume that the third child pays a regular fee to get in.
2 adults = 2 * $4.50 = $9.00
2 children = 2*$2.75/2= $2.75
1 more child=1*$2.75 = $2.75
Total $14.50
The 2 children 1/2 price is rather tricky. You could firgure out what 1/2 price is and then just double it, but that is rather long. And it will come to what I have. So let's try it
1/2 of 2.75 = 1.375
2 * 1.375 = 2.75
It is just as easy to show it rather than doing it.