Jow buys 9 cds for the same price, and also a cassette tape for $9.45. His total bill was $118.89. What was the cost of one CD?

Question

I am very confused on the concept of an equation to be made.

Answer 1

Since each CD costs the same,

 

Let x = cost of a CD

 

We establish an equation:

 

 

9x + 9.45 = 118.89

9x = 109.44

  x = 12.16

 

 

The cost of one CD is $12.16