You have just received a windfall from an investment you made in a$$ friend's business. He will be paying you $$$$30,000$ at the end of this$$ year, $$$$40,000$ at the end of the following$$ year, and $$$$50,000$ at the end of the year after that $(3$ years from$$ today$).$ The interest rate is $9\mathrm{.}5\%$ per year.

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

b$.$ What is the future value of your windfall in $3$ years$($on the date of the last$$ payment$)?$