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$1391.32 per ounce .. how much per gram?
For my science homework, I have to figure out how much the gold Australian coins would cost if they were pure gold.
I've figured out that (in Australian dollars) one ounce of gold costs 1391.32 dollars.. by finding that in US dollars it costs $904.5 per ounce, I changed that to Australian dollars by dividing it by 0.6501 (the exchange rate between the Australian and American dollar that I'm using).
Now, I need to figure out how to change that price to price per GRAM. How on earth do I do that ..
Here again: Gold costs AU$1391.32 per OUNCE
I want to know how much it would cost per GRAM.
If one ounce equals approx. 28 grams, would I multiply my price by 28?
Thanks so much, my science teacher refuses to help me -.-
Thanks again!! This will really help me!
I have to do it for the Silver coins too and it's SO annoying!
Anyway - help me, answer!
I will best answer 
Monfri's got it almost right.
The mistake is that precious metals are measured in troy ounces, not avoirdupois ounces. There are 31.1 grams in one troy ouce, so you need to divide by 31.1, not 28.
One of the beauties of the metric system is that a gram is always a gram, but in the English-American system an ounce can be many things.
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