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A 115-lb (52.5-kg) softball player has an average daily intake of 325 g of carbohydrate, 55 g of protein, and 75 g of fat.

Approximately what percentage of her calories come from protein?

Answer :

Final answer:

Approximately 20.5% of the softball player's calories come from protein.

Explanation:

The percentage of calories that come from protein can be calculated by multiplying the grams of protein consumed by the number of calories per gram of protein, and then dividing that by the total number of calories consumed.

In this case, the softball player consumes 55 g of protein, and since 1 g of protein provides 4.1 kcal, the total number of calories from protein is 55 g * 4.1 kcal/g = 225.5 kcal.

To calculate the percentage, divide the calories from protein by the total number of calories consumed (which is the sum of calories from protein, carbohydrate, and fat) and multiply by 100: (225.5 kcal / (325 g * 4.1 kcal/g + 55 g * 4.1 kcal/g + 75 g * 9 kcal/g)) * 100 ≈ 20.5%.

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