Because currently there are shops such as Pearl milk tea shop, which is a favorite of teenagers, including the group that I am like I am drinking, which purchased the time waiting for them to like my observations in the steps how to make Pearl milk tea. And like the questionnaire, cost, and profit making Pearl milk tea. So I want to learn about the maximum profit in selling Pearl milk tea each day many glass should be sold. So, I was able to get maximum profit, are interested in the knowledge that will lead to "a linear schedule" used in the calculation for decision making in education research.
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