"Abdul plans to have $5 million when he retires, 20 years from now. (a) If a bank gives you an interest rate of 1% every month, how much do you need to invest every month in your savings account to retire with the $5 million in 20 years? Assume your first payment in your account will be made in 1 month. (b) If a bank gives you an interest rate of 0.5% every week, how much you need to invest every week in your savings account to retire with the $5 million in 20 years? Assume your first payment in your account will be made today