$7.50 with a 6.5% tax
We need to add 100% to it so now it's: 106.5%
Now we need to change it to a decimal and we do that by moving the decimal two spaces to the left.
106.5 = 1.065
We now multiply 1.065 and $7.50
7.50 × 1.065 = 7.9875
We need to round it so now it's $7.99