The regular price of the computer is $849
The store offers a 20% discount
After the discount is applied, a 6% sales tax is added.
To determine the discount, you have to calculate how much the 20% of 849 is, to do so, multiply 20 by 849 and divide it by 100:
[tex]\frac{20\cdot849}{100}=\frac{16980}{100}=169.8[/tex]The discount is $169.8