its very important for me plz give me a answer

Sophie invested $1,700 at the beginning of every 6 months in an RRSP for 11 years. Fo 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 5.30% compounded semi-annually. a. Calculate the accumulated value of her investment at the end of the first 7 years. O $49,471.28 o $49,866.94 O $27,429.75 $28.019.49 b. Calculate the accumulated value of her investment at the end of 11 years. O $49,471.28 O $49,866.94 O $43,345.67 O $28,019.49 c. Calculate the amount of interest earned from the investment. $12,466.94 $12,071.28 $10,740.76 O $1,726.18