To determine a reasonable amount of tile for Mandana to order, we first need to calculate the range of the extra materials she wants to order (between 15% and 20%) based on the area of her kitchen floor, which is 118.9 square feet.
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Calculate 15% of 118.9 square feet: \[ 0.15 \times 118.9 = 17.835 \text{ square feet} \]
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Calculate 20% of 118.9 square feet: \[ 0.20 \times 118.9 = 23.78 \text{ square feet} \]
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Calculate the total amount of tile to be ordered:
- For 15% extra: \[ 118.9 + 17.835 \approx 136.735 \text{ square feet} \]
- For 20% extra: \[ 118.9 + 23.78 \approx 142.68 \text{ square feet} \]
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Determine the range of the total area to order:
- Minimum amount to order (15% extra): 136.735 square feet
- Maximum amount to order (20% extra): 142.68 square feet
Now we have the range of tile to order, which is approximately between 136.735 square feet and 142.68 square feet.
- Review the answer choices:
- A. 139 square feet
- B. 133 square feet
- C. 136 square feet
- D. 144 square feet
Among the options:
- 139 square feet falls within the range of 136.735 to 142.68.
- 133 square feet is below the minimum.
- 136 square feet is slightly below the minimum.
- 144 square feet is above the maximum.
Therefore, the most reasonable amount of tile for Mandana to order is A. 139 square feet.