3.1 "Inequality Relations" ppt-SUJU compulsory five courseware 1 Tickets for a museum are 10 yuan per person, 20% discount for group tickets for more than 20 people (including 20 people), then when less than 20 people, what kind of purchase Ticket strategy? Question 1: How much is a ticket for a 20% discount? How much will it cost to buy a group ticket for 20 people? Question 2: When is buying a separate ticket cheaper than buying a group ticket for 20 people? When is buying a group ticket for 20 people cheaper than buying a ticket alone? Question 3: What kind of mathematical model is used to solve this problem?

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