Answer:
The perimeter of one poster is 57 inches.
Explanation:
The perimeter of a rectangle is given by:
![P = 2(w + h)](https://img.qammunity.org/2022/formulas/mathematics/college/9e1gvr4f69q7hxf6z2actxizjd9r0e0l5i.png)
Where:
w: is the widht = 12.5 in
h: is the height = 16 in
Hence, the perimeter is:
![P = 2(w + h) = 2(12.5 + 16) = 57 in](https://img.qammunity.org/2022/formulas/mathematics/college/1njeuqieskd00p61xuevdo5u5123ehf13z.png)
Therefore, the perimeter of one poster is 57 inches.
I hope it helps you!