Alex invested $2,000 at the beginning of every 6 months in an RRSP for 11 years. For the first 7 years it earned interest at a rate of 4.30% compounded semi-annually and for the next 4 years it earned interest at a rate of 5.70% compounded semi-annually.

Calculate the accumulated value of his investment after the first 7 years.

Calculate the accumulated value of his investment at the end of 11 years.

Calculate the amount of interest earned from the investment.