A state education department wants to estimate the percentage of the state's school students who receive a government scholarship.
The state's schools are split into two regions, and each region is sampled at its own rate:
| Region | Schools in region | Schools randomly selected |
|---|---|---|
| Urban | 400 | 20 |
| Rural | 1,600 | 40 |
Within each region the selected schools are a simple random sample of that region's schools, and every student in a selected school is surveyed (one-stage cluster sampling inside each region).
The completed survey returns:
| Region | Students surveyed | Receiving a scholarship |
|---|---|---|
| Urban | 12,000 | 3,600 |
| Rural | 16,000 | 2,400 |
Estimate the percentage of all students in the state who receive a scholarship.
Give your answer as a percentage (a number between 0 and 100), rounded to one decimal place — for example 12.3, not 0.123.