关于sales

vivian2011

这几天做GWD遇到一些题目涉及到sales, profits, revenue 等概念，我自己的概念中，sales和revenue是一样的概念,但是在GMAT中似乎有这样的一个公式： profit=price*sales-cost 也就是说revenue=price*sales.
所以我推断sales是指单位销量。
在下面这个题目中我排除了C选项，因为按照GMAT的定义来(sales=\=revenue)，C是无关的，但是如果按我自己之前的定义来（sales=revenue）那么就是有关的，这题选D. 想跟大家confirm一下我对sales的理解是否正确？

题目：
FastMart, a convenience store chain, is planning to add pancake syrup to the items it sells.  FastMart stores do not have shelf space to stock more than one variety of syrup.  Surveys of FastMart customers indicate that one-fourth of them prefer low-calorie syrup, while three-fourths prefer regular syrup.  Since FastMart’s highest priority is to maximize sales, the obvious strategy for it is to stock regular syrup.

Which of the following, if true, most seriously weakens the argument?

A:    eople buying pancake syrup at convenience stores, unlike those buying it at supermarkets, generally buy it only a few times.
B.    eople who prefer low-calorie syrup generally use about the same amount of syrup on their pancakes as those who prefer regular syrup.
C.    Regular syrup does not sell for a higher price per unit than low-calorie syrup.
D.    In general, customers who prefer regular syrup will buy low-calorie syrup if regular is unavailable, but those who prefer low-calorie will not buy regular syrup.
E.    Sales of syrup are not expected to account for a large proportion of total dollar sales at the average FastMart store.