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AoPS Wiki talk:Problem of the Day/July 27, 2011

Problem

AoPSWiki:Problem of the Day/July 27, 2011

Solution

You spent 10 dollars buying the coupon, so you must save 10 dollars on something else. So, $0.15x=10$ and $x=10\div 0.15 \approx 66.67$ --Michelangelo 21:20, 26 July 2011 (EDT)

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