Percentage (nutrition labels)

I am in the 6th grade and I have no whatsoever clue on this type of problem concerning nutrition labels and turning them into percentages. One question states **what percent of daily values of sodium is contained in a serving of a food. in other words find x. sodium is 230mg. **

Indeed, all I need to know is how to find the percentage of daily values of sodium, carbohydrate. Also, I want to know how to find the percent of calories(130) from fat(35). Please tell me how you find this.