The total cost of the materials is determined as $(2,226x + 2,544).
How to determine the total cost of the materials?
The total cost of the materials is calculated by applying the following formula as shown below:
The perimeter of the model is calculated as;
P = (8x + 7) ft + (6x + 9) ft + (6x + 9) ft + (8x + 7) ft
P = 28x + 32, ft
The total perimeter that can cover the hall is calculated as;
Total perimeter = 30 (28x + 32), ft
The total cost of the materials is calculated as;
cost of one crown model = $2.65 per foot
Total cost = 30(28x + 32) x 2.65
Total cost = 79.5(28x + 32)
Total cost = $(2,226x + 2,544)
The missing diagram of the model is in the image attached.