Answers:
Price Tax Rate Tax
$299 4% $11.96
$6,750 7% $472.5
$76.50 5.2% $3.98
$18.32 3.9% $0.71
$5.95 6.2% $0.37
$13.89 4.3% $0.60
$768.43 3.7% $28.43
$6.49 5.8% $0.38
$23.86 7.1% $1.69
$12.98 3.9% $0.51
Explanation;
Sales tax is computed as the product of the price times the tax rate in % divided by 100:
Here is each compute: