We are told that Dontax bought the stereo on a sale of 20% off, meaning he will only have to pay 100% -20% = 80% of the price.
Now, 80% of $199 is
[tex]199\times\frac{80}{100}[/tex][tex]=\$159.2[/tex]Hence the amount of money Dontay saved is
[tex]199-159.2=\$39.8[/tex]Which is our answer!
