Answer: Bilbo would need to save a total of $6,200 per month
Step-by-step explanation:
In order to reach his first objective of having $25,000 per month for 25 years after retirement, Bilbo would need to save $2,922 per month in Years 16 through 30. This is because he needs to accumulate enough money to cover the first withdrawal of $25,000 plus 25 years of withdrawals at the same rate, which is calculated by multiplying the amount of the first withdrawal by (1.0725/1.10)^15. To cover his second objective of purchasing a cabin in Rivendell in 15 years, he would need to save an additional $373 per month during Years 16 through 30. This is calculated by subtracting the amount he has already saved for the 15 years prior from the total cost of the cabin. Finally, to cover his third objective of leaving an inheritance of $500,000 to his nephew Frodo, he would need to save an additional $1,905 per month during Years 16 through 30. This is calculated by subtracting the amount he has already saved for the 15 years prior from the total inheritance.
Therefore, Bilbo would need to save a total of $6,200 per month in Years 16 through 30 in order to meet all three of his objectives.