Question 1184605
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The flat shipping fee is $6, so he has $39 to spend on cards.<br>
Obviously he can buy a maximum number of cards if he can buy them at the lower rate.<br>
With $39 at $0.75 per card, the number of cards he could buy is 39/0.75 = 52.  Since the lower rate is applicable if the number of cards is 50 or more, he can qualify for the lower rate.<br>
So the maximum number of cards he can buy is 52.<br>
But it's not clear what the question is asking....<br>
Asking "how many possible cards a client could buy" is sloppy language and does not necessarily mean it is asking for the maximum possible number.<br>
So, since the minimum number that can be ordered is 25....<br>
ANSWER: Spending at most $45, a client can buy any number of cards from 25 to 52, inclusive<br>