Answer :
The percentage of calories from fat in a quarter-pound fast-food hamburger sandwich with 400 calories and 20 grams of fat is 45%. This is calculated by multiplying grams of fat by 9 (the number of calories per gram of fat) and divvying it up by the total calories.
To calculate the percentage of calories from fat in a quarter-pound fast-food hamburger sandwich that contains 400 calories and 20 grams of fat, you can use the information that one gram of fat contains nine calories. First, multiply the amount of fat in grams by the number of calories per gram of fat:
20 grams of fat × 9 calories/gram = 180 calories from fat.
Next, divide the calories from fat by the total number of calories, and then multiply by 100 to get the percentage:
(180 calories from fat / 400 total calories) imes 100 = 45%.
So, the hamburger has 45% of its calories coming from fat.
This high percentage illustrates why fast-food meals can be calorically dense, leading to a higher intake of calories than a person might expect, given the size of the meal. It also reflects on why such meals may contribute to excess calorie consumption and associated health risks like obesity and cardiovascular diseases mentioned in the case study conclusion.
