How can u determine the total cost of an item including tax if you know the price of the item and the tax rate

There are 2 ways. You can take the initial price and multiply it by the tax rate and then add them together, or you can take the tax rate and add 1 to it and the product will be the final answer.

For example:

If the price is 2 and the tax rate is 7 cents a dollar, it will look like this:

2.00 *.07 =.14

2.00 +.14 = 2.14

OR

2.00 * (1 +.07)

2.00 * 1.07 = 2.14