20 pounds
It is impossible to give an answer. For instance, a metre of copper wire, or a metre of a copper ingot?
0.002? I think, but one pound is worth $0.77... prices change on a daily basis.. As of April 2008, the price per pound of copper, depending on grade of copper, is between $3 - $3.50 May 2010: approx. 9 US cents, but depending on quality. See also the link below.
how much is 68 points garnet worth on my 9ct gold ring
This depends on the quality of copper; analytical grade copper is more expensive; but generally speaking the cost of 7 g copper is not significant.
$2.80
3$ per pound
$3.34-$3.35
Around $4.25 USD
The value is determined by weight. Copper is currently about $3.75/pound, so weigh your copper and do the math.
Today, copper is worth 3 to 4 dollars. To be more specific, about $3.76.
Not much. copper is currently at $4.32 a pound, and there are about 14.4 troy ounces in a pound, which means your troy ounce is worth about 30 cents.
At present (11 May 2012), one British pound is worth about $1.61 in US dollars.
About 26 cents, but copper is priced by the pound and right now, a pound of it is $3.20. (However, it's usually SOLD by the ton, as most industrial metals are.)
How much 90 pounds of copper cost
Exactly the value of the copper in the coin. No more. The current price of copper is about $3.50 pound. So your coin just has sentimental value.
It's worth 2 cents for the copper content.