Can You Solve This Puzzle?

First, you have to know that a penny scale is an antiques scale in many stores where you placed a number of items on it and inserted a penny to find the weight. Now the puzzle starts.

You have a number of bags with gold bricks weighing one pound each in them and one bag with fake gold bricks weighing 1.1 pounds in them.

How can you use the penny scale ONCE!!! To determine which bag has the fake gold? For this example let us say you have 5 bags total.

Begin!!!