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Not for the mathematically faint hearted....

Carrying Optimal Change in Your Wallet

whereby the nerds prove the precise combination of coins to carry to have change for any monetary transaction without overburdening your pocket in weight.

http://dualnoise.blogspot.com.es/2012/07/carrying-optimal-change-in-your-wallet.html

Alas, the study is in US Dollars.

Of course, you can always opt for a ClearCash card ( http://www.clearcash.co.uk) and do away with the heavy metal.
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