A potato contains 20 g of carbohydrate. if carbohydrate has a caloric value of 4 kcal/g, how many kcal are obtained from the carbohydrate in the potato?

It's a simple multiplication question. 20 grams of carbohydrate present in 1 potato. As per the instructions Carbohydrate has 4kal/gram. To get the answer for how many kilocalorie carbohydrate is present in one potato, we have to multiply (20 x 4) that is 80 kcal.