Final answer:
To calculate the percentage of fat by calories for the cream of mushroom soup, you need to know the amount of fat in grams and the total calorie content. Multiply the grams of fat by 9 to get the calories from fat, divide by total calories, and multiply by 100 for the percentage.
Step-by-step explanation:
The question pertains to the calculation of the percentage of fat by calories in a given food item, in this case, cream of mushroom soup. To determine the percentage of fat by calories, we need to understand that each gram of fat provides 9 calories. If a food item contains, for instance, 8 grams of total fat and a total of 230 calories, we can calculate the percentage of fat by calories by first determining the calorie contribution of the fat, which would be 8 grams multiplied by 9 calories per gram, equaling 72 calories from fat. Then, divide the calories from fat by the total number of calories, finally multiplying by 100 to get the percentage.
72 calories from fat / 230 total calories × 100 = roughly 31.3%
However, without knowing the specific caloric content and the grams of fat in the cream of mushroom soup, an exact answer cannot be provided. The student must provide nutritional information for the soup or find the information on the product label or database to perform the calculation.