4) Find the following accumulated values on December 31, 2020. a) $6000 is invested every three months to an account earning i=5% starting on January 1, 2014. b) Payments of $30,000 are made every May 31 for 7 years with the first payment in 2011. Use 5.8% interest. c) $5000 is invested on June 1, 2017 into an account paying 7% simple interest. d) Payments are made continuously over 2016-2020 at the payment rate of rate of $18,000 per year Use a 5% force of interest. 4) Find the following accumulated values on December 31, 2020. a) $6000 is invested every three months to an account earning i=5% starting on January 1, 2014. b) Payments of $30,000 are made every May 31 for 7 years with the first payment in 2011. Use 5.8% interest. c) $5000 is invested on June 1, 2017 into an account paying 7% simple interest. d) Payments are made continuously over 2016-2020 at the payment rate of rate of $18,000 per year Use a 5% force of interest