please help me out.

$2000 was deposited at the end of every 3 months for 6 years into a fund earning 7.6% compounded quarterly. After this period, the accumulated money was left in the account for another 9 years. During this 2nd period, the fund was earning 10.2% compounded quarterly. (1) Calculate the accumulated amount at the end of the 15-year period. Calculate the total interest earned through the 15-year period