Concept:
Neonatal Mortality Rate (NMR) is the number of deaths of infants within the first 28 days of life per 1000 live births in a given year.
Formula:
\[
\text{NMR} = \frac{\text{Number of neonatal deaths}}{\text{Number of live births}} \times 1000
\]
Given:
Live births = 4,000
Neonatal deaths = 100
Step 1: Substitute values into the formula
\[
\text{NMR} = \frac{100}{4000} \times 1000
\]
Step 2: Calculate
\[
\text{NMR} = 0.025 \times 1000 = 25
\]
Final Answer:
\[
\text{Neonatal Mortality Rate (NMR)} = 25 \text{ per 1000 live births}
\]