Answer:
404.7 --> 405 (when rounded)
Explanation:
In order to find the answer to your question, we would need to find how much of 570 is 29%, and subtract that number to 570.
The reason why we would do this is because in the question, it says that the sales dropped 29% for one quarter to the next. This means that the next quarter would drop 29%.
We know that they sold 570 units, so we would use 570 in our calculations.
We know that the sales decrease by 29%, so we would multiply 570 by 0.29 to find how much of 570 is 29%.

29% of 570 is 165.3
What we would do now is subtract 570 by 165.3 in order to fin how much sales they made in the next quarter.

Once you're done solving, you would get the answer of 404.7
This means that they sold 404.7 (405 when rounded) CDs in the next quarter.
I hope this helps you out.
Good luck on your academics.
Have a fantastic day!