Below I have posted a link to the answers for the UKMT mathematical challenge 2007.
Hope this helps :)
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The weight of a 2007 Cent is 2.5 grams. Of this, 0.8% is copper.
I was born on 20072020 - 13 = 2007
Current retail value for the 2007 28 coin set is $30.00 Issue price was $22.95
Don't work it out with your calculator.
5 cents