How do you find the total amount after a 12% tax on £150?

The total amount after a 12% tax on £150 is £168.

To find the total amount after adding a 12% tax to £150, you first need to calculate the amount of tax. You do this by finding 12% of £150. To find a percentage of a number, you can convert the percentage to a decimal and then multiply by the number.

So, 12% as a decimal is 0.12. Now, multiply £150 by 0.12:
\[ 150 \times 0.12 = 18 \]
This means the tax amount is £18.

Next, add the tax amount to the original price to find the total amount:
\[ 150 + 18 = 168 \]
Therefore, the total amount after adding a 12% tax to £150 is £168.

This method can be used for any percentage and any original amount. Just remember to convert the percentage to a decimal by dividing by 100, multiply by the original amount to find the tax, and then add the tax to the original amount to get the total.