if a slice of bread with 1 gram of fat, 10 grams of carbohydrate, and 2 grams of protein contains 57 calories, calculate the percent of calories provided by fat. if a slice of bread with 1 gram of fat, 10 grams of carbohydrate, and 2 grams of protein contains 57 calories, calculate the percent of calories provided by fat. 57% 9% 16% 30%