OG 2021 的一道逻辑题求解

bizzle

A library currently has only coin-operated photocopy machines, which cost 10cents per copy. Library administrators are plannig o refit most of those machines with card readers. The library will sell prepaid copy cards that allow users to make 50 copies at 9 cents per copy. Administrators believe that, despite the convinence of copy cards and their lower per-copy cost, the numer of copies made in the library will be essentially unchanged after the refit.

On the assumption that administrators' assessment is correct, which of the following prediction about the effect of the refit is most strongly supported by the information given?

A. Library patrons will only purchase a copy card on days when they need to make 50 or more copies

B. No library patrons will increase their usage of the library's photocopy machines onece the refit has been made.

C. If most of the copy cards sold in the library are used to their full capacity, the number of people using the library's photocopy machines over a period will fall.

D. Revenues from photocopying will decrease unless most library patrons choose to use the remaning coin-operated machines in preference to the card-reader equipped ones.

E. Revenues from photocopying will increase if copy cards that are purchased are, on average, used to significantly less than 90% of their capacity.

我选的是B，答案选的是E，但是官方解释有点看不懂，想看看论坛里大佬有没有能解惑的，感谢！

77isshe

懂了，原来还是没读懂题！

bizzle

lawrence0902 发表于 2021-3-25 10:28
商业想法里，改造肯定是为了盈利呀，那要考虑卡怎么才能盈利呢？成本不变的情况下，那就是买了50次但实际不 ...

同意！               

lawrence0902

商业想法里，改造肯定是为了盈利呀，那要考虑卡怎么才能盈利呢？成本不变的情况下，那就是买了50次但实际不用到50次呀。再进一步想，到底少用多少次才能和原来的价钱扯平呢？是不是45次，原本45次要450cents，现在50次，450cents呀。45是不是正好50的90%呢？
其实GMAT很多都是商业问题，联系实际考虑会更清楚，这题其实就是现在卖充值的会员卡么，你越不用他们越开心呀。
选B的问题其实很简单，你不能保证NO ONE will do.太绝对了。