Final answer:
Rachel needs to invest approximately $392,400 in an annuity with an interest rate of 6% in order to withdraw $2,775 each month for 20 years.
Step-by-step explanation:
To find the amount Rachel needs to invest (present value) in an annuity, we can use the present value formula for an ordinary annuity:
PV = PMT * ((1 - (1 + r)^(-n)) / r)
Where PV is the present value, PMT is the monthly withdrawal amount, r is the annual interest rate divided by 12 (since we're calculating monthly withdrawals), and n is the total number of months (20 years * 12 months/year).
Plugging in the values from the question, we have:
PV = 2775 * ((1 - (1 + 0.06/12)^(-20*12)) / (0.06/12))
Simplifying this expression gives us:
PV ≈ $392,408.45
Therefore, Rachel needs to invest approximately $392,400 to be able to withdraw $2,775 each month for 20 years.