Find the following accumulated values on December 31, 2020.

a) $5000 is invested every two months to an account earning i=7% starting on

January 1, 2015.

b) Payments of $40,000 are made every October 31 for 8 years with the first

payment in 2011. Use 6% interest.

c) $5000 is invested on February 1, 2019 into an account paying 7.5% simple

interest.

d) Payments are made continuously over 2013-2020 at the payment rate of

rate of $15,000 per year Use a 7% force of interest.

.