A country has crude birth rate 25 per 1000 and crude death rate 10 per 1000. What is the growth rate of that country –
### **Core Concept**
The growth rate of a country can be estimated using the crude birth rate (CBR) and crude death rate (CDR) through the formula: Growth Rate = (CBR - CDR) / 1000.
### **Why the Correct Answer is Right**
To calculate the growth rate, we subtract the CDR from the CBR and divide by 1000. Given a CBR of 25 per 1000 and a CDR of 10 per 1000, the growth rate is (25 - 10) / 1000 = 15 / 1000 = 1.5 per 1000. This represents a 1.5% growth rate, as the rate is expressed as a percentage of the population.
### **Why Each Wrong Option is Incorrect**
* **Option A:** This choice is incorrect because the growth rate is not 2.5%. The difference between the CBR and CDR is 15, which is then divided by 1000 to get the growth rate.
* **Option B:** This option is incorrect because the growth rate is not 5.0%. The calculation of 15 / 1000 equals 1.5, not 5.
* **Option C:** This choice is incorrect because the growth rate is not 15%. The correct calculation is a percentage of the population, which is 15 / 1000 = 1.5%, not 15%.
### **Clinical Pearl / High-Yield Fact**
When calculating growth rates using CBR and CDR, remember that the growth rate is the difference between the birth and death rates, expressed as a percentage of the population. This formula is a useful tool for estimating population growth in the absence of more detailed demographic data.
### **Correct Answer Line**
✓ Correct Answer: D. 1.50%