Hi,

For QA
Cost per hinge is as follows
16/2p which is 8/p

For QB
Cost per hinge is 4/p÷2 which is 8/p

So C

Explanation

Plug in a value for p. Try p = 16: In Quantity A, then 16 hinges cost a total of 32 cents, for an average cost of 2 cents per hinge; in Quantity B, 4 hinges cost a total of 8 cents, for, again, an average cost of 2 cents per hinge.

The quantities are equal, so eliminate choices (A) and (B). Any value for p will yield the same results: The quantities will always equal; the
answer is choice C.
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