Biology question

Question

1. Charles had 1 cup of clam chowder, which contains 16g of carbs, 12g of fat, and 9g of protein. 

How much energy, in kilocalories, is in the clam chowder? 

Answer 1

Carbs provide 4 calories/gm, protein 4 per gram and fat 9 per gram.

So (16x4) + (9x4) + (12 x 9)=64+36+172=272 calories