Answer: Total cost to make 12 pennants is $52.5.
Step-by-step explanation:
Since we have given that
There is a rectangle and a triangle.
Length of rectangle = 1 ft
Width of rectangle = 3 ft
So, Area of rectangle is given by
![Area=Length\times Breadth \\\\Area=1\times 3\\\\Area=3\ ft^2](https://tex.z-dn.net/?f=Area%3DLength%5Ctimes%20Breadth%20%5C%5C%5C%5CArea%3D1%5Ctimes%203%5C%5C%5C%5CArea%3D3%5C%20ft%5E2)
Base of triangle = 1 ft
Height of triangle = 1 ft
So, Area of triangle is given by
![Area=\frac{1}{2}\times base\times height\\\\Area=\frac{1}{2}\times 1\times 1\\\\Area=\frac{1}{2}\ ft^2](https://tex.z-dn.net/?f=Area%3D%5Cfrac%7B1%7D%7B2%7D%5Ctimes%20base%5Ctimes%20height%5C%5C%5C%5CArea%3D%5Cfrac%7B1%7D%7B2%7D%5Ctimes%201%5Ctimes%201%5C%5C%5C%5CArea%3D%5Cfrac%7B1%7D%7B2%7D%5C%20ft%5E2)
So, Total area of the pennants will be
![3+\frac{1}{2}\\\\=\frac{6+1}{2}\\\\=\frac{7}{2}\ ft^2](https://tex.z-dn.net/?f=3%2B%5Cfrac%7B1%7D%7B2%7D%5C%5C%5C%5C%3D%5Cfrac%7B6%2B1%7D%7B2%7D%5C%5C%5C%5C%3D%5Cfrac%7B7%7D%7B2%7D%5C%20ft%5E2)
Number of pennants = 12
Cost per square foot of pennant = $1.25
So, Total cost for 12 pennants is given by
![12\times \frac{7}{2}\times 1.25\\\\=\$52.5](https://tex.z-dn.net/?f=12%5Ctimes%20%5Cfrac%7B7%7D%7B2%7D%5Ctimes%201.25%5C%5C%5C%5C%3D%5C%2452.5)
Hence, Total cost to make 12 pennants is $52.5.