To find out what percentage of Gabriela's take-home pay will be used to pay rent after the increase, we can follow these steps:
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Calculate the new take-home pay after the increase: \[ \text{New take-home pay} = 2800 + 210 = 3010 \]
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Calculate the new rent after the increase: \[ \text{New rent} = 700 + 210 = 910 \]
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Calculate the percentage of take-home pay used for rent: \[ \text{Percentage for rent} = \left( \frac{\text{New rent}}{\text{New take-home pay}} \right) \times 100 \] \[ = \left( \frac{910}{3010} \right) \times 100 \approx 30.23% \]
Based on the calculations, the percentage of Gabriela's take-home pay that will be used to pay rent is approximately 30.2%.
So, the correct answer is 30.2%.