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A quarter-pound fast-food hamburger sandwich provides 400 calories and contains 20 grams of fat. what is the percentage of calories from fat?a quarter-pound fast-food hamburger sandwich provides 400 calories and contains 20 grams of fat. what is the percentage of calories from fat?

Respuesta :

kristoffer
Fat has 9 calories per gram. If you have 20 grams of fat, this equals:
9 calories per gram x 20 gram = 180 calories. 
You calculate the percentage like this:
180 calories / 400 calories = 0,45
0,45 x 100 = 45%
45 percent of the 400 calories comes from fat. 

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