3) Find the values of following annuities on December 31, 2020 using 6% interest. a) Payments of $2,5000 made on the first day of January, April, July,and October starting in 2016. b) Payments at the rate of $18,000 per year made continuously from September 1, 2013 to August 31, 2019. c) Payments of $45,000 per year starting on January 1, 2023 and continuing for ever