A firefighter weighing 200 lb (91 kg) consumes 3,500 calories per day comprised of 1.4 g/kg of protein and 6 g/kg of carbohydrates. What percentage of the calories is comprised of fat?

To determine the percentage of calories comprised of fat in this scenario, it's important to start with the amounts of protein and carbohydrates consumed, and then calculate the remaining calories that can be attributed to fat.

First, calculate the protein intake in grams. The firefighter consumes 1.4 grams of protein per kilogram of body weight:

1.4 g/kg × 91 kg = 127.4 grams of protein

Since protein provides 4 calories per gram, the total caloric intake from protein is:

127.4 g × 4 cal/g = 509.6 calories from protein

Next, calculate the carbohydrate intake. The firefighter consumes 6 grams of carbohydrates per kilogram of body weight:

6 g/kg × 91 kg = 546 grams of carbohydrates

Carbohydrates also provide 4 calories per gram, so the total caloric intake from carbohydrates is:

546 g × 4 cal/g = 2,184 calories from carbohydrates

Now, add together the calories from protein and carbohydrates:

509.6 calories (from protein) + 2,184 calories (from carbohydrates) = 2,693.6 total calories from protein and carbohydrates.

Now, subtract the total calories from protein and carbohydrates from the firefighter's total caloric