Please show all your work

You just turned 35 years old today and have saved $45,000 toward retirement. You have committed to saving $10,000 per year at the end of each of the next 15 years and $15,000 per year at the end of the following 15 years. You plan to retire starting at age 65. You want to have funds available for each of your expected 15 years of retirement. These funds will need to be available for withdraw at the beginning of each year of retirement; that is, when you make the last $15,000 annual deposit, you immediately start withdrawing annual payments from your retirement account. Required: a. Assuming an annual, after-tax interest rate of 4.5 percent throughout the entire period of time, what will be the amount of each of those 15 annual retirement payments? b. Now suppose you want to leave an estate of $100,000 to your heirs when you pass away after the last annual retirement payment has been exhausted. By how much will this gesture diminish your spendable portion of each retirement payment computed in part a? Assume the conditions stated in part a