Find the present values of the following annuities on December 31, 2020 assuming that payments are made continuously. Use a 5% force of interest and let January 1,2021 represent t=0

a) Payments at the rate of $20,000 per year starting in 2021 and continuing for ever.

b) Payments at the rate p(t) = 8000e^0.02t 0 10

c) Payments at the rate p(t) =