Abigail invested $875 at the end of every month in an investment fund that was earning interest at a rate of 4.68% compounded monthly. She stopped making regular deposits at the end of 6 years when the interest rate changed to 6.75% compounded quarterly. However, she let the money grow in this investment fund for the next 5 years. a. Calculate the accumulated balance in her investment fund at the end of 6 years. Round to the nearest cent b. Calculate the accumulated balance in her investment fund at the end of 11 years. Round to the nearest cent c. Calculate the total interest earned over the 11-year period. Round to the nearest cent