pretend that today is your birthday and you decide to start saving for retirement. you will retire on your $70$th birthday and need $$4,500$ per month for the next $20$ years, increasing $$200$ per month after the first month. you will make your first withdrawal on your $70$th birthday, the day you retire. you will make the first deposite in a week in an account payihng $5\%$ interest compounded daily, and continue to make the same $$321\mathrm{.}90$ equal weekyl deposit up to your $60$th birthday, then you stop making deposits. what birthday are you celebrating today? create a cash flow diagram.