a) What current C would be needed if retiring right now, given the expected Social Security as well as the desired WRR and current salary?

b) What C would be needed in 20 years when retiring after adjusting for inflation?

c) What would an annuity starting at this C and growing by inflation, lasting for 15 years, cost given the investment r?

d) What would above cost as an annuity due?

e) What annual savings needs to be done for the 20 years to save up and reach the cost in d, including the effect of current savings?

f) What annual savings needs to be done for the 20 years to save up and reach the cost in d, not including the effect of current savings?

Given

Salary = 120,000

Desired WRR = 80%

Expected SS = 20,000

Remaining work years = 20

Expected retirement years = 15

Current savings = 10,000

Investment r = 8%

Inflation = 3%