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One gram of carbohydrate contains approximately 4 calories. If the cereal contains 30 grams of carbohydrate, this would mean that 120 calories come from carbohydrates. 120 calories is 50% of 240; therefore, carbohydrates comprise of 50% of the total calories for your cereal.

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Q: If a cereal contains 30 grams of carbohydrate and a total of 240 calories per serving calculate the percentage of calories derived from carbohydrate?
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