An investment of $18,000 is growing at 3% compounded semi-annually. a. Calculate the maturity value of this investment at the end of year 1 . Round to the nearest cent b. If the interest rate changed to 5% compounded monthly at the end of year 1 , calculate the maturity value of this investment at the end of year 4. Round to the nearest cent c. Calculate the total amount of interest earned from this investment during the 4-year period. Round to the nearest cent