(Answered) A video movie store owner finds that 30 of the customers

Economics

A video movie store owner finds that 30% of the customers entering the store ask an assistant for help and that 20% of the customers make a purchase before leaving. It is also found that 15% of all customers both ask for assistance and make a purchase. What is the probability that a customer does at least one of these two things?

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Business Economics, Economics

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