What is the approximate percentage growth of coal production in China between the period 1981-2010?

100%

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250%

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450%

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600%

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Solution

The correct option is C 450%
Production in 1981= 0.6 bn tones

Production in 2010= 3.24 bn tones

Factor of Multiplication = $\frac{3.25}{0.6}$ $\approx$ 5.5

Hence, percentage increase= (FOM-1) $\times$ 100 $\approx$ 450%

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