Question
One coffee shop was having a special promotion for breakfast. Xuan wanted to invite her pupils for a meal at the coffee shop. Each breakfast set costs $8.60. What is the minimum amount that Xuan must pay for her 21 pupils?

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One coffee shop was having a special promotion for breakfast. Xuan wanted to invite her pupils for a meal at the coffee shop. Each breakfast set costs $8.60. What is the minimum amount that Xuan must pay for her 21 pupils?