Please explain the answer in detail

You are a financial consultant who helps people to plan their funds for a secure retirement. Two sisters have come to you for your advise of investment options for their retirement. One of them, A is 40 years and the other one, B is 30 years old. A wishes to invest Rs. 5000 and B wishes to invest Rs. 10000 per year starting next year till the age of 60 years. You have advised them to invest in the stock market, which is expected to provide an average return of 12% in future. Both the sisters wish to withdraw at the age of 60. Summarize the details of the investment in both the sisters. Explain the results in terms of time value of money (Ignore Taxes)