Please explain the steps. Thank you so much!

Assume that you have just turned 20 and are planning for your retirement. You would like to stop working and take a $100,000 yearly withdrawal from your personal investment account in Years 51-80 (30 years), and you assume that any other needs will be met by having a company pension and/or social security benefits to which you might be entitled. You realize that your salary will increase over time so you intend to deposit $5,000 in each of Years 21-30 (10 years) and then deposit $10,000 in each of years 31-40 (10 years). If you believe that the appropriate interest rate is an effective annual rate of 9 percent per year, determine how much you would have to deposit ireach of Years 41-50 (10 years) so that you can begin making your withdrawals in Year 51