You have the formula, all you need to do is input all the variables given to you in the formula.
I=Prt
=> I=3000*0.06*2
=> I=360
I havent done this kind of math in a long time so i might be a little rusty
Answer: 
Step-by-step explanation:
Let be "x" the price in dollars of one copy of the city newspaper.
You need to analize the information provided in the exercise:
1. The total number of copies of the city newspaper sold in the newspaper stand is:

2. The amount of money earned by selling 1,000 copies of the city newspaper is:

Then, you can determine that the value of "x" can be found with:

3. Finally, substituting values, you get:

It could be between 18 and 2.