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Alexis will need $520 to pay off how much gallons she will need to cover the 7,800ft2 of the barn.

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SA= 7,800. 80 x 30 x 2 + 30 x 50 x 2 = 7,800

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We did 30x80x2 and got 4800. Then we did 30x50x2 and got 3000. 4800+3000=7800

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we did 80 x 30 x 2 and 50 x 30 x 2 and added them and got 7,800 and we did 7,800 divided by 420 and got 19 and then we did 19 x 28 and got $532

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So my group and I did 80 x 50 x 2 + 30 x 50 x 2 to get a total SA of 7,800ft2.