Alabel from a carton of orange juice is given above. it states that one serving, 12 fluid ounces (355 ml, the volume of a can of soda), provides 108 mg vitamin c, which is 120% of the recommended daily allowance (rda), based on a 2000 calorie diet. (a). how many dietary calories are present in one serving? (b). what is the the recommended daily allowance (rda) of vitamin c? useful information: 1 g carbohydrate contains = 4.0 dietary calories.