What is the basic unit of structure and function in all living things?

The information about the basic unit of structure and function in all living things can be revealed by the cell theory. It says that all living things are made of cells which is a basic basic unit of structure and function. I  am pretty sure it will help you, regards!

As you've got 15%, the best thing to do is to find 10%, then multiply it by 1.5. Once you've found the tip, you add this onto the cost of the meal.
Therefore, the total cost of $25 meal with a 15% tip is $28.75
Hope this helps :)