Answer:
$16.90
Step-by-step explanation:
The sales tax for each CD was $1.30 and there were 4 CD's so multiply $1.30 by 4 and you'll get $5.20, subtract $5.20 from $72.80 and you'll get $67.60. This means that $67.60 is the overall price (without tax) of the four CD's. Divide $67.60 by 4 and you'll get $16.90 this is the original price of one CD.