A woman consumes 500 grams of carbohydrate, 30 grams of protein, and 75 grams of fat in one day. How many total kcalories has she taken in, and how many and what percentage of kcalories are from carbohydrate, protein, and fat? A. Total kcalories:
B. Percentage of kcalories from carbohydrate:
C. Percentage of kcalories from protein:
D. Percentage of kcalories from fat:

Answer and Explanation:

The computation is shown below:

A. For Total k. calories

= (Number of grams in carbohydrates × 1 gm of carbohydrates) + (Number of grams in protein × 1 gm of proteins) + (number of grams in fat × 1 gm in fat)

= (500 × 4) + (30 × 4) + (75 × 9)

= 2000 + 120 + 675

= 2795 k. calories

b. As we know that

1 gm of carbohydrates = 4 k. calories

So, for 500 grams it would be

= 500 × 4

= 2000 k. calories

Now the percentage is  

= Total grams in carbohydrates ÷ Total kcalories

= 2000 ÷ 2795

= 0.72

= 72%

C.  As we know that

1 gm of proteins = 4 k. calories

So, for 40 grams, it would be

30 × 4 = 120 k. calories

Now the percentage is

= Total grams in protein ÷ Total kcalories

= 120 ÷ 2795

= 0.043

= 4.3%

D. As we know that

1 gm of fat = 9 k. calories

So for 75 grams, it would be  

75 × 4 = 200 k. calories

So, the percentage is

= Total grams in fat ÷ Total kcalories

= 200 ÷ 2795

= 0.072

= 7.2%