Final answer:
To calculate the percentage of Alice's budget that goes towards paying rent, divide her rent by her average monthly salary and multiply by 100.
Step-by-step explanation:
To calculate the percentage of Alice's budget that goes towards paying rent, we need to divide her rent by her average monthly salary and then multiply by 100. In this case, her rent is $800 and her average monthly salary is $3,800. So, the calculation would be:
(800 / 3800) * 100 = 21.05%
Therefore, option a) 21.05% is the correct answer.