Answer:
b
Step-by-step explanation:
50% because half of 3000 is 1500
The composed fraction means that the input of is the ouput of .
So, the chain is
The domain of is composed by all inputs which are not zero, otherwise we would have a zero denominator.
So, since doesn't accept 0 as an input, and we want to feed it with , we conclude that can't be zero.
So, we have
Since
we have
Since these two points cases to vanish, they can't be accepted as inputs by .