Answer: The original number of CDs is between 1000 and 1500.
Explanation:
Since we have given that
Number of copies of a popular CD left to be sold in the store = 15
According to question, this is between 15 and 1.5% of the original number of copies of the CD in the store.
Let the original number of copies of the CD in the store be 'x'.
Now, 15 is equal to 1% of the original number of copies of the CD, it becomes
![1\%\ of\ x=15\\\\(1)/(100)* x=15\\\\x=15* 100\\\\x=1500](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6w602g7pnhlplfaijaoyr3s7cmlpvmv1d1.png)
Or if 15 is equal to 1.5% of the original number of copies of the CD, it becomes
![1.5\%\ of\ x=15\\\\(1.5)/(100)* x=15\\\\(15)/(1000)x=15\\\\x=(15* 1000)/(15)\\\\x=1000](https://img.qammunity.org/2020/formulas/mathematics/middle-school/szqpl736sfkguzy38zkx3kgye6ef4aim6v.png)
Hence, the original number of CDs is between 1000 and 1500.