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This is the image:

barn

So the question is:

(a) Ralph is painting the barn, including the sides and roof. He wants to know how much paint to purchase. What is the total surface area that he is going to be painting? Round to the nearest hundredth.

(b) If one paint can covers 57 square feet, how many paint cans should he purchase?

(c) If each paint can costs $\$23.50$, how much will the paint cost?

I've done a little the first part, but since the surface area is off, all the other parts are off as well. Please show me how to get the surface area

My work so far

(A) Total Surface Area Rectangular Prism 2(wl + hl + hw)

2 (45 x 20 + 15 x 20 + 15 x 45) = 3750

Triangular Prism L + 2B h(a + b + c) + Ab

45(15 + 20 + 15) + 4 x 20 2250 + 80 2330

Total surface area - 3750 + 2330

6080

(B) Paint Cans

6080 / 57

106.6 or 107 paint cans I had to divide the total surface area with how much area one paint can would cover.

(C) Price

If each paint can costs $\$23.50$, and Ralph buys 107 paint cans, he will spend $\$2,514.50$

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