# A restaurant bill comes to $28.35. How do you find the total cost if the tax is 6.25% and a 20% tip is left on the amount before tax?

##### 1 Answer

See a solution process below:

#### Explanation:

First, we can determine the amount of the tax:

Where:

Substituting gives:

Next, we can determine the amount of the tip:

Where:

Substituting gives:

Now, we can add the amount of the bill, the tax and tip amounts to find the total cost: