You have just received a windfall from an investment you made in a$$ friend's business. She will be paying you $ $16,845$ at the end of this$$ year, $ $33,690$ at the end of next$$ year, and $$50,535$ at the end of the year after that$($three years from$$ today$).$ The interest rate is $5\mathrm{.}4\%$ per year.

a$.$ What is the present value of your$$ windfall?

b$.$ What is the future value of your windfall in three years$($on the date of the last$$ payment$)?$