Is it permissible to feed a poor person for the atonement (fidya) of breaking the Ramadan fast for an elderly person with a meal of a chicken sandwich and fries along with a can of soda, as the value of the meal that a person normally eats?

The sufficient amount for the Fidyah is to feed one poor person a Mudd of food, which is equivalent to 750 grams of rice or the prevalent staple food of the country. It is also sufficient to provide a fulfilling meal to a poor person, and what is considered is a moderately satisfying meal.