An investment of $$17,000$ is growing at $4\%$ compounded semi$-$annually.a$.$ Calculate the accumulated amount of this investment at the end of year $1.$b$.$ If the interest rate changed to $3\%$ compounded monthly at the end of year $1,$ calculate the accumulated amount of this investment at the end of year $4.$c$.$ Calculate the total amount of interest earned from this investment during the $4-$year period.