请问“这个学校食堂哪个菜最便宜”翻译成英语怎么说？

which dish is the most inexpensive in the school's canteen?

最好不要用cheap,因为那指的是廉价，有些贬义。

what's the cheapest food in this cafeteria?

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补充，因为楼主说的就是“便宜”。= =#

如果他问“哪个菜最实惠”或“最经济”，我就不会说cheapest了……

which is the cheapest dish in the school dining hall?

which is the most cheap dish in the eatery of this school？