It is a single purchase.
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pleasehelpBut two x-rays could be counted as a set or single purchase too, right?It could be one purchase or two. What is in your head when you say it?
CalifJimHow come two X-rays are so expensive? (In your head: Why are those two purchases of those two X-rays so expensive?) (You are thinking of the two X-rays as two separate units.)
How come two X-rays is so expensive? (In your head: Why is that purchase of two X-rays so expensive?) (You are thinking of the two X-rays as a si