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Population growth is the increase in the number of individuals in a population over a specific period of time. It's a critical factor in societal development, affecting everything from economic growth to environmental sustainability.

When discussing population growth, it's essential to understand that it doesn't just refer to the number of births. It takes into account the total number of births, deaths, and net migration (the difference between the number of people moving into and out of a region). A good way to imagine it is by picturing a bustling city. Each year, some people are born (increasing the population), others pass away (decreasing it), and still others might move to or from the city (either increasing or decreasing it).

In the case of Nigeria, a growth rate of 2.5% indicates that, over the time period specified (usually a year), the population is expected to increase by 2.5% due to these combined factors. It's like adding 2.5 new people for every 100 existing residents each year.

Percentage increase is a way to express the relative change in a quantity as a proportion of the original value. It’s a universal concept, and you encounter it everywhere – from checking how much your investment has grown, to seeing how much a slice of pizza has gone up in price.

To calculate the percentage increase, you subtract the original value from the new value, then divide the result by the original value and multiply by 100 (to convert it to a percentage). It's like measuring how much taller a plant has grown compared to its original height.

In practical terms, if Nigeria’s population were 100 million people last year, and it grew by 2.5% this year, the new population would be 102.5 million people. This percentage increase helps us express growth in a way that's easy to understand and compare, regardless of the absolute numbers involved.

The rate of change is the speed at which a variable changes over a specific period of time. In mathematics and economics, it provides a snapshot of how quickly something is increasing or decreasing, such as population, prices, or speed.

It's akin to watching the speedometer in a car – it tells you how quickly the car's speed is changing. When the rate of change is constant, it indicates uniform growth. When it's variable, it reflects acceleration or deceleration, much like a car speeding up or slowing down.

For Nigeria, with a growth rate of 2.5%, we see a steady rate of change in the population. This implies a uniform increase: year after year, the population is growing at this steady pace, assuming the rate doesn't change. Noting the rate of change is significant, as it helps predict future figures and plan accordingly for things like resource allocation, urban planning, and public services.