Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. In the example shown the formula in D6 is. 3100 3100 003.
In other words you can translate any percentage into a decimal by dividing by 100.
Add up 100 400 600 1100. Percentage may also be referred to as out of 100 or for every 100. 50 ml 300 ml 350 ml for the total volume of the solution. When you mix solutions the volumes arent always additive so volume percent is a good way to express concentration.