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320cm^2

Step-by-step explanation:

Surface area is the sum of areas of each side of the shape:

Area of cross section x 2 = 1/2 x 8 x 2 x 15 = 8 x 15 = 240cm^2

Area of base = 15 x 2 = 30cm^2

Area of slope = 17 x 2 = 34cm^2

Area of back = 8 x 2 = 16cm^2.

Now, surface area of whole shape is the sum of these areas:

16+30+34+240 = 320cm^2

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step-by-step explanation: