Answer:
The price of each CD before tax is $12.50.
Explanation:
Given:
Lamar bought 3 CDs that were each the same price, including sales tax he paid a total of 40.20.
Of that total,2.70 was tax.
Now, to find the price of each CD before tax.
So, we reduce the tax from total:

Now, as given the price of each were same:

Therefore, the price of each CD before tax is $12.50.