Which of the following correctly represents the method of calculating the percent of calories from saturated fat in one serving of yogurt?

Question

BlackTom AI · Accepted Answer

Question restatement: We are asked which option correctly represents the method of calculating the percent of calories from saturated fat in one serving of yogurt.
Option 1: 4.5 g of saturated fat x 9 kcal/g. This computes the calories from saturated fat but does not relate them to the total calories in the serving, so it omits dividing by the total calories, which is necessary to obtain a fraction or percent.
Option 2: 4.5 g of saturated fat x 9 kcal/g ÷ 170 total kcal. This yields the calories from saturated fat (4.5 × 9 = 40.5 kcal) divided by the total calories (170 kcal), giving a fraction of calories from saturated fat. To express as a percent, you would multiply by 100, but the core method to obtain the portion of calories is correctly represented here by performing the fat calories over total calories.
Option 3: 4.5 g of saturated fat × 4 kcal/g ÷ 170 total kcal. This uses 4 kcal per gram, which is incorrect because fat provides 9 kcal per gram, not 4. This misstates the energy yield of fat and thus yields an incorrect fraction.
Option 4: 4.5 g saturated fat ÷ 170 total kcal. This divides mass of fat by total calories, which mixes units (grams of fat with kilocalories) and fails to convert fat grams to calories before comparing to total calories; it is not a valid method for calculating calories from fat.
Option 5: 4.5 g of saturated fat x 9 kcal/g ÷ 7 g total fat. This divides by total fat grams (7 g) rather than total calories, and also uses the wrong denominator for expressing percent of calories; it misaligns what is being compared (calories from fat vs total calories).
Overall reasoning: The correct approach to determine the percent of calories from saturated fat is to convert grams of saturated fat to calories using 9 kcal per gram, then divide by the total calories in the serving to obtain the fraction; and to express as a percent you would multiply by 100. Among the options, the expression that follows this correct sequence (fat calories divided by total calories) is Option 2, even though it omits the final step of converting the fraction to a percent by multiplying by 100. The other options either use an incorrect energy value per gram, fail to convert fat grams to calories, or divide by an inappropriate total (such as total fat grams).

Which of the following correctly represents the method of calculating the percent of calories from saturated fat in one serving of yogurt?单项选择题

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