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A library currently has only coin-operated photocopy machines, which cost 10 cents per copy. Library administrators are planning to 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 convenience of copy cards and their lower per-copy cost, the number 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 predictions 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 once 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 given period will fall.
D) Revenues from photocopying will decrease unless most library patrons choose to use the remaining 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 percent of their capacity.
答案选E.还有,各位大神。这题算难题吗?真心看不懂
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