A gift is not generous unless it is intended to benefit the recipient and is worth more than what is expected or customary in the situation; a gift is selfish if it is given to benefit the giver or is less valuable than is customary.
Principle 1
not intended to benefit recipient gift not or → generous not worth more than what is expected or typical in the situation
Principle 2
given to benefit giver or → gift is selfish less valuable than customary
Evaluate
The first rule is triggered by unless, which means the same thing as "if it is not the case that".
When we see, "It is not X unless it's Y", then we could rephrase that as, . ~Y → ~X
There's a tricky aspect here, though because we're applying the "if-not" to a complex idea. If we're given, , then we're saying, .
Negating (Y and Z) turns it into ~Y or ~Z.
That makes sense, since we know that if Y is not true, then it's certainly . Similarly, as soon as we know Z is not true, then it's not the case that Y and Z are true.
Thus, becomes ~Y or ~Z → ~X
The second conditional is easier to deal with because the word "if" indicates the idea that goes on the trigger. So becomes, Y or Z → X
Goal
When we're provided with two conditional principles, the correct answer (almost?) never uses both of them. So the first thing we do when we read each answer is check to see what it's conclusion is.
If it's concluding "not generous", then we'll use rule 1 and see whether the answer choice establishes the trigger.
If it's concluding "selfish", then we'll use rule 2 and see whether the answer choice establishes that rule's trigger.
If it's concluding "it is generous" or "it isn't selfish", we'll just throw it out without reading it. These rules have no power to prove something is generous or isn't selfish.