23 December 2006


Tricky maths

An ounce of gold sells at USD 620.
An ounce of platinum sells at USD 1220.
Why am I correct to say that platinum is 2.39 times more expensive than gold?
I am stumped because according to my book, both are measured in Troy ounces (31+ grams) rather than more common avoirdupois (28+ grams). So I must plead ignorance. Can you give us a hint?

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