Question
One cafe was having a special promotion for buffet. Julie wanted to invite her students for a meal at the cafe. Each buffet set costs $8.40. What is the minimum amount that Julie must pay for her 21 students?

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One cafe was having a special promotion for buffet. Julie wanted to invite her students for a meal at the cafe. Each buffet set costs $8.40. What is the minimum amount that Julie must pay for her 21 students?