(10,695/15,500 -1) * 100% = -31%
The price was decreased 31%.
1. You have the function 
2. You know that
with
, because the division by zero is not defined. So ,
for
where
is a integer number.
3. Then, to find the domain of the function given in the problem, you must make 
Where
is odd number.
4. Therefore:

5. Finally, the domain is: 
The answer is: 
Answer:
The equation for this sentence is: 9 = 2(4y)
1260-360-360-360=180
Therefore,180