To find the percentage of students who have a phone plan with texting, we need to add the number of students who have plans that include texting. The relevant plans are:
- Voice and texting (12 students)
- Voice, texting, and data (4 students)
So the total number of students with texting plans is:
12 (Voice and texting) + 4 (Voice, texting, and data) = 16 students
Now, we need to determine the total number of students surveyed:
- No cell phone: 20 students
- Voice only: 14 students
- Voice and texting: 12 students
- Voice, texting, and data: 4 students
Total = 20 + 14 + 12 + 4 = 50 students
Now, we calculate the percentage of students with a phone plan that includes texting:
\[ \text{Percentage} = \left( \frac{\text{Number of students with texting}}{\text{Total number of students}} \right) \times 100 \]
\[ \text{Percentage} = \left( \frac{16}{50} \right) \times 100 = 32% \]
Thus, the answer is 32%.