I think you are missing part of the problem. If you had another equation or a value for x you could solve it.
Gabriela spends about 30% of her take home pay on rent.
Average rate of the function: 3
Step-by-step explanation:
The function in this problem is

The average rate of change of a function over an interval
is given by

where
are the values of the function calculated in
respectively
For the function in this problem we have:
, so

, so

So, the average rate of change is

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