To determine how many packages of stickers are needed, you first need to know the surface area of the wooden door stopper. However, since the surface area is not provided in your question, I will guide you through the process of calculating the number of packages required:
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Calculate the total surface area of the door stopper (you'd need the dimensions to do this).
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Divide the surface area of the door stopper by the area that one package of stickers covers (which is 75 cm²).
\[ \text{Number of packages} = \frac{\text{Surface area of door stopper}}{75 \text{ cm}^2} \]
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Round up to the nearest whole number because you can only purchase whole packages.
Since the surface area of the door stopper isn't provided in your scenario, please provide that information or check the surface area, and then follow these steps to find the number of packages required.
Without knowing the surface area, you cannot specifically determine whether 5.5, 6, or 7 packages are needed. However, if you assume that you have calculated the surface area and come up with a specific value, you would simply apply the formula above and round up to find your answer. If, for example, the surface area were approximately 450 cm², you would calculate:
\[ \frac{450 \text{ cm}^2}{75 \text{ cm}^2} = 6 \]
Thus, you would need 6 packages in that case.
Please provide the surface area for a precise answer or apply the calculation based on the area you have!