Answer:
We know he bought 3 CDs and he paid 49.50 dollars, which the tax included. Now, we can calculate how much did he pay for each CD by dividing the total cost (49.50) by the number of CDs (3):
49.50/3 = 16.50
Now, we know each CD costs 16.50 with tax included so, if it has a tax of1.10 dollars, we only need to substract the price (16.50) and the tax (1.10)
16.50 - 1.10 = 15.40
Without tax, ech CD costs 15.4 dollars ($15.4)