Final answer:
The percentage of total calories from fat is approximately 11.11%.
Step-by-step explanation:
To calculate the percentage of total calories from fat, we need to divide the number of calories from fat by the total calories and then multiply by 100. In this case, there are 20 calories from fat out of 180 total calories. So, the calculation would be: (20/180) * 100 = 11.11%
Therefore, the answer is not provided as one of the options in the question (a, b, c, or d).