What is the difference between a serving and a portion?

Portion is how much food you choose to eat at one time, whether in a restaurant, from a package or in your own kitchen. A portion is 100 percent under our control. Many foods that come as a single portion actually contain multiple servings. Serving Size is the amount of food listed on a product's Nutrition Facts label.

expected return 12.60%

Explanation:

we have to weight the outcomes:

we multiply the return consiering the probability of occurrency then, we add them to know the expected return o nthe investment which, in this case, is 12.60%