Answer:
I found this! I hope this helped!
To calculate the sales tax of 5% on $120 without using a calculator, you can use the following method:
1- Multiply the cost of the item ($120) by the percentage of the sales tax (5%) expressed as a decimal.
$120 x 0.05 = $6
2- Add the sales tax amount to the original cost of the item.
$120 + $6 = $126
So the total cost with the sales tax would be $126