If there is a 9.5% sales tax, you can just multiply 79.99 by 1.095 because you are paying 100% of 79.99 + 9.5% of 79.99. This can be written like the following:
(100%)*(79.99)+(9.5%)*(79.99) = (1)*(79.99)+(0.095)*(79.99) = (1+0.095)*(79.99) = (1.095)*(79.99) = 87.59
498.00 plus 7.25 percent sales tax = 534.11
51.80 plus 6 percent sales tax = 54.91
39.90 plus 7 percent sales tax = 42.69
29.99 plus 6 percent sales tax = 31.79
150,000 plus 5 percent sales tax = 157,500.00
39.95 plus 5 percent sales tax = 41.95
498.00 plus 7.25 percent sales tax = 534.11
51.80 plus 6 percent sales tax = 54.91
39.90 plus 7 percent sales tax = 42.69
29.99 plus 6 percent sales tax = 31.79
150,000 plus 5 percent sales tax = 157,500.00
91.97 plus 8.75 percent sales tax = 100.02
54.99 + 0.075% sales tax = 55.03
$8.50 + 6% sales tax = $9.01
11.98 + 6% sales tax = 12.70
25 percent off of 39.99 plus 6 percent sales tax results in a final cost of $31.79
16.00 + 6.75% sales tax = 17.08