how should i find the answer to this??

A CD usually sells for $17.00. If the CD is 10% off, and sales tax is 6%, what is the total price of the CD, including tax?

 

$17 x 10% =$1.70 discount

$17 - $1.70=$15.30 sale price before 6% sales tax.

$15.30 x 1.06 =$16.22 total price of the CD including 6% sales tax.

Let x=17$ initial cost.

 

After the discount x'=x-10%x=17$-1.7$=15.3$

After the tax: x''=x'+6%x'=15.3$+6% 15.3$=15.3$+0.918$=16.218$

 

The total price is x''=16.218$