Please throughly answer the two questions. Thank you!

3) Social Security Retirement Benefits:
    Social Security is one form of retirement benefit for the people working in America. There are certain qualifications for this scheme and based on that, benefits are calculated at the retirement age. The age of entry and exit from the plan are the primary criteria of this plan, since the number of years in the plan is important for calculation of the retirement benefit.
a) For Social security both employers and the employees contribute. It is paid through payroll, the amount deducted is mentioned in W2. It is calculation on the salary, 6.2 % of the wages both employees and employers contribute at the same rate. For self-employed individuals the percentage is 12.4%.
b) The estimate of the social security retirement benefit can be done through SSA website. There are certain terminologies which need to be understood.
AIME- Average Indexed monthly earnings: It considers...