A CD that regularly sold for $17.99 is marked 10% off how much is the sale price of the CD

To find the sale price of the CD, you need to subtract the discount percentage from the original price.

Discount = Original Price x Discount Percentage
Discount = $17.99 x 0.10
Discount = $1.799

Sale Price = Original Price - Discount
Sale Price = $17.99 - $1.799
Sale Price = $16.19

Therefore, the sale price of the CD is $16.19.