Population Growth and Decrease Methods

This video tutorial covers the concepts of population increase and decrease, explaining both traditional and formula methods for calculating changes over time. It includes examples of population growth, decline, and mixed changes, emphasizing the importance of using the correct formula for each scenario. The tutorial also highlights common mistakes and provides guidance on when to use each method.

What is the main focus of this lesson?

• Studying historical population data

• Understanding population increase and decrease

• Learning about different cultures

• Exploring geographical features

Which formula is used to calculate population after a certain number of years?

• P = A + R

• P = A * (1 + R/100)^n

• P = A / (1 + R/100)^n

• P = A - R

In the example given, what was the initial population in 2002?

• Ten thousand

• One crore

• Four thousand

• One million

What is the traditional method based on?

• Exponential decay

• Simple interest

• Compound interest

• Linear growth

When is it advised to use the formula method over the traditional method?

• For n years ago calculations

• For n years after calculations

• For both n years ago and after

• Never

In the traditional method example, what was the population increase percentage per annum?

• 10%

• 15%

• 20%

• 5%

Using the formula method, what was the population of Chennai City in 2017?

• 4000

• 4600

• 5290

• 6000

In the decrease scenario, what was the annual decrease rate?

• 20%

• 15%

• 10%

• 5%

What was the population of Chennai City after three years of decrease?

• 2,91,600

• 3,24,000

• 3,60,000

• 4,00,000

In the multiple year changes example, what was the population at the end of the third year?

• 5000

• 6000

• 5720

• 5500