An 18-cent coin would be easier on American pockets.
References
Shallit, J. What this country needs is an 18¢ piece. Mathematical Intelligencer, 25, 20 - 23, (2003).
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Ball, P. Ditch the dime for less change. Nature (2003). https://doi.org/10.1038/news030512-9
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DOI: https://doi.org/10.1038/news030512-9
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