Holy cow people. Pretty nasty responses to the QOTD. In fact the ONLY possible right answer to the question is the one about datatypes. Yes the calculation is incorrect but that is not relevant to the question being asked here. It states that the query provided a certain set of results, it did NOT state that the results were incorrect. The question was why are the results what they are.  Perhaps a correct calculation but still having the integer division issue would have been better but given the verbiage of the question there is only one possible correct answer. The fact that the calculation is incorrect is something entirely different.