You are planning to start graduate school in three years. Your first year tuition is \$ 15,000 to be paid at t=3 and your second year tuition is $18,000 to be paid at t=4. Estimate the amount of money you need to invest today in a mutual fund yielding 5% to cover your future tuition expenses. $27,190 $27,766 $28,521 $28,665