Using the following standards (carbohydrates (4 Cal/g), protein (4 Cal/g), and fats 9 Cal/g), determine the caloric content of a bag of your favorite...

Using the following standards (carbohydrates (4 Cal/g), protein (4 Cal/g), and fats 9 Cal/g), determine the caloric content of a bag of your favorite snack food. 

a serving of chips has 20g of carbs, 1 g of protein and 8 grams of fat. there are 7 servings total.

wondering if some one could check my answers/calculations.

20g x 4Cal/1g = 80 cal

1g x 4Cal/1g= 4 cal

8g x 9Cal/1g = 72 cal.

156 Cal per serving.

156 x 7 servings = 1092 Cal