If the television is on sale for 15%, that means that the selling price before tax will be 100 - 15 = 5% of the original price.
1250 * 0.85 = $1062.5 ... this is your selling price BEFORE tax
Now, calculate your tax.
You would pay (1062.5) + (1062.5 * 0.065)
= 1062.5 + 69.06 (your tax)
= 1131.56 dollars