40. In year 2000 world gold production was 2547 metric tons and it was growing exponentially at the rate of 0.6% per year. If the growth continues at this rate, how many tons of gold will be produced from 2000 to 2013? (eb 078 = 1.0811]
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Last month the price of gold hit a record high, pushing above $2,000 (£1,575) an ounce.
While this price rise was driven by gold traders, it begs the question about the supply of the precious metal, and when it will eventually run out.
Gold is in hot demand as an investment, a status symbol, and a key component in many electronic products.
But it's also a finite resource, and there will eventually come a stage when there is none left to be mined.
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