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Another Conversion Question?

In 1933, the United States went off the international gold standard, and the price of gold increased from $20.00 to $35.00/troy oz. The twenty-dollar gold piece, known as the double eagle, weighed 33.436 g and was 90.0% gold by mass. (a) What was the value of the gold eagle before and after the price change? (b) How many coins could be made from 2.00in3 of gold (1 troy oz.=31.1 g; d of gold=19.3g/cm3)?

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