Final answer:
Cory gets approximately 18% of his energy from protein, as he consumes 90 grams of protein which corresponds to 360 calories, making up 18% of his total energy intake of 2000 calories.
Step-by-step explanation:
To calculate the percentage of energy that Cory gets from protein, we first need to know the energy content of protein. Each gram of protein provides approximately 4 calories. Cory's intake of 90 grams of protein would thus provide 90 grams * 4 calories/gram = 360 calories from protein.
Next, we calculate the percentage of his total energy intake that comes from protein. We divide the 360 calories from protein by the total energy intake of 2000 calories and then multiply by 100 to get the percentage: (360 calories / 2000 calories) * 100 = 18%.