$(($ i already did number one i need help with $2,3,4))$

Estimate Nest EBG:

Assuming a $3\%$ interest rate, use the Payout Annulty formula to determine your required nest eg$8($amount needed at retirement$)$ to be able to withdraw $$\frac{2500}{?}$ month for $20$ years.

you need $$450,777\mathrm{.}29$ in your account before you retire.

II$.$ Calculate Investment Requirements:

You have $40$ years until you can retire and have found an annuity paying $3\%$ per month. How much will you need to deposit each month for the next $40$ years to have your required nest egg $($part I abovel?

III. Interest:

Determine the amount of your nest egg that is earned interest.

IV$.$ Cost of postponing:

a$)$ If you decided to put off investing for $10$ years, how much would you have after $30$ years of investing, assuming you made the same investment calculated in part I?