Based on the current rates of increase of 1.5% per year, the world population is projected to double from 7 billion ina.15 yearsb.100 yearsc.46 yearsd.10 years
Question
Based on the current rates of increase of 1.5% per year, the world population is projected to double from 7 billion in:
- a. 15 years
- b. 100 years
- c. 46 years
- d. 10 years
Solution
The question is asking for the time it would take for the world population to double from 7 billion at a rate of 1.5% increase per year.
To solve this, we can use the rule of 70, which is a way to estimate the number of years it takes for a certain variable to double. The rule of 70 states that to find the doubling time of a quantity growing at a given annual percentage rate, divide the percentage number into 70.
So, in this case, we divide 70 by 1.5, which equals approximately 46.67 years.
Therefore, the closest answer is c. 46 years.
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