The total cost of the television is equal to its price plus sales tax:
total cost = price + sales tax
Now 6.5% of $120 is
[tex]120\times\frac{6.5}{100}[/tex][tex]7.8[/tex]Therefore, the sales tax is $7.8 and hence the total cost is
total cost = $120 + $7.8 = $127.8
total cost = $127.8
which is our answer!