Use the tables to answer the question.

To determine who spends less time on homework per night, we can calculate the average number of hours spent per day for both Marco and Maribella.

**Marco's Homework:**
1. For 3 days: \( \frac{3.25 \text{ hours}}{3 \text{ days}} = 1.083 \text{ hours per day} \)
2. For 9 days: \( \frac{9.75 \text{ hours}}{9 \text{ days}} = 1.083 \text{ hours per day} \)
3. For 12 days: \( \frac{13.0 \text{ hours}}{12 \text{ days}} = 1.083 \text{ hours per day} \)
4. For 30 days: \( \frac{32.5 \text{ hours}}{30 \text{ days}} = 1.083 \text{ hours per day} \)

Average for Marco: \( 1.083 \text{ hours per day} \)

**Maribella's Homework:**
1. For 4 days: \( \frac{4.2 \text{ hours}}{4 \text{ days}} = 1.05 \text{ hours per day} \)
2. For 8 days: \( \frac{8.4 \text{ hours}}{8 \text{ days}} = 1.05 \text{ hours per day} \)
3. For 20 days: \( \frac{21.0 \text{ hours}}{20 \text{ days}} = 1.05 \text{ hours per day} \)
4. For 28 days: \( \frac{29.4 \text{ hours}}{28 \text{ days}} = 1.05 \text{ hours per day} \)

Average for Maribella: \( 1.05 \text{ hours per day} \)

Now, comparing the averages:
- Marco averages 1.083 hours per day.
- Maribella averages 1.05 hours per day.

Since 1.083 > 1.05, Marco spends more time on homework per night compared to Maribella.

The correct response is: **Maribella spends less time on homework per night.**