31.034% of calories is derived from fat.
Total number of calories of carbhohydrates=4×80=320
Total number of calories of proteins=4×20=80
Total number of calories of fat=9×20=180
(Multiply the grams of fat by 9 and divide the result by the total calories to get the percent of fat)
Percentage of calories,derived from fat=[tex]\frac{180}{320+80+180}[/tex]×100=0.3103=31.034
Each macronutrient contains a different amount of calories, according to the USDA:
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