Monica invested $875 at the end of every month in an investment fund that was earning interest at a rate of 4.26% compounded monthly. She stopped making regula 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 3 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 9 years. Round to the nearest cent c. Calculate the total interest earned over the 9-year period. Round to the nearest cent