To determine the amount of wallpaper Katerina needs to purchase, we first need to calculate the total area of the wall and then subtract the area of the windows.
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Calculate the area of the wall:
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Calculate the area of one window:
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Calculate the area of both windows:
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Subtract the area of the windows from the area of the wall to find the area that needs to be covered with wallpaper:
Thus, Katerina should purchase 132 ft² of wallpaper.
The correct response is 132 ft².