In 1975, the consumption of water for human use was about 3850 cu km/yr. It increased to about 6000 cu km/yr in the year 2000. Find the percent increase in the consumption of water from 1975 to 2000. Also, find the annual percent increase in consumption (assuming water consumption increases uniformly).

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Solution

The consumption of water for human in 1975 = 3850 cu km/yr
The consumption of water for human in 2000 = 6000 cu km/yr
Increase in consumption of water in 1975 to 2000 = 6000 - 3850 = 2150 cu km/yr
In percentage $= \frac{2150}{3850} \times 100 = 55.84 %$

In 25 yr total increase in water consumption = 2150 cu km/yr
$∴$ Annualy, i.e. per year water consumption $= \frac{2150}{25} = 86 c u k m / y r$ [ $∵$ 2000 - 1975 = 25yr]
$∴$ In percentage $= \frac{86}{3850} \times 100 = \frac{8600}{3850} = 2.23 %$

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