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# Percentage growth of population?

The population of the worlds 12 largest urban areas in 1990 and their populations in 1970 are given:

Urban area, 1970 (pop. in millions) & 1990 ( pop. in millions)

1. Tokyo/Yokohama, 14.91, 19.28

2. Mexico City, 9.12, 20.25

3. Sao Paulo, 8.22, 18.77

4. New York, 16.29, 15.69

5. Shanghai, 11.41, 12.35

6. Calcutta, 7.12, 12.54

7. Buenos Aires, 8.55, 11.71

8. Rio de Janerio, 7.17, 11.27

9. London, 10.59, 10.40

10. Seoul, 5.42, 11.66

11. Bombay, 5.98, 11.79

12. Los Angeles, 8.43, 10.48

which urban area has the largest PERCENTAGE growth? What is that percentage?

Which area has the largest percentage loss? what is that percentage?

### 2 Answers

- MathMan TGLv 71 decade agoFavorite Answer
For each one, you divide the 1990 population by the 1970 population.

For example, Tokyo: 19.28 / 14.91 = 1.293 (rounded)

Since it is greater than 1, the population grew.

Had it stayed the same, the ratio would have been 1.000, which would represent that the population was 100% of what it was.

But it is more than 100%, it grew to 129.3% of what it was. Then subtract 100, leaving the growth which was 29.3 %

(Multiply the ratio by 100, then (effectively) divide by 100 by writing "%")

If we look at New York, the "growth" was 15.29 / 16.29

or 0.9386.

This is less than 1, representing loss of population (or in new terminology "negative growh", which is an abomination). Again you subtract 100 from 93.86, yielding -6.14 or 6.14 % loss.

So for each of the twelve cities, you divide new pop by old pop.

The one with largest ratio N.xxxx had the highest percentage growth (represented by the (N-1)xx.xx %).

The one with smallest fraction (0.yyyy) had the largest percentage loss (represented by yy.yy - 100 %).

I'm not going to work out the numbers for the others for you.

- piekarskiLv 45 years ago
It used to be a populace broaden consisted of 15% of kids being born to teens, 15% of individuals residing off welfare or in poverty, five% of kids born from the Dugger household and best thirteen.three% to useful, dependable mothers and fathers. Making it a complete of forty three.three% Giving us a one hundred% danger of the sector growing to be just like the film Idiocracy.