Respuesta :
50.4-2.8=47.6
47.6/4=11.9
Each CD, before tax, cost $11.90.
As you can see above, I subtracted the sales tax from the total price first. Since each CD cost the same amount and there are 4 CDs in all, you can divide the price of all 4 CDs by 4 to find the price of 1 CD.
Hope this helps!
Let x = $ of cds
We can use the equation 4x +2.80 = 50.40 to represent the grand total
Now we can just solve this equation to find the value of x
4x + 2.80 = 50.40
-2.80 -2.80
4x = 47.60
/4 /4
x= 11.90
Each CD costed $11.90 before tax.