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First, I would base the problem out of 100, since that is how percentages work. Therefore, if 25% buy both bread and milk, then 40-25= 15 only buy milk, and 30-25= 5 only buy bread. Add 15+5+25= 45, and 100-45= 54. Hence, 54% of all convenience store shoppers buy neither bread nor milk.

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Q: Surveys show that 40 percent of all convenience store shoppers buy milk and 30 percent buy bread If 25 percent buy both bread and milk what percentage buys neither?
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