The answer and the work

Step-by-step explanation:

Let's let represent the cost of tapes, and be the cost of CDs.

From the problem statement, we can create the following two equations:

To solve this system of equations, we can solve for in the second equation and substitute into the first equation to get the value of :

Substitution:

Now that we know the cost of the tapes, we can plug this value into either equation to get the cost of CDs:

or

Therefore, the cost of a tape is and the cost of a CD is .

the answer is 5636.7

step-by-step explanation: