(Complex annuity) Upon graduating from college 40 years ago, Dr. Nick Riviera was already thinking of retirement Since then he has made deposits into his retirement fund on a weekly basis in the amount of $20. Nick has just completed his final payment and is at last ready to retire His retirement fund has earned 8 1% interest compounded weekly a. How much has Nick accumulated in his retirement account? b. In addition to all this, 15 years ago, Nick received an inheritance check for $20 000 from his beloved uncle. He decided to deposit the entire amount into his retirement fund. What is his current balance in the fund? a. Since graduating from college 40 years ago, Dr. Nick Riviera has made deposits into his retirement fund on a weekly basis in the amount of $20. If his retirement fund has eamed 8.1% interest compounded weekly, how much has Nick accumulated in his retirement account? (Round to the nearest cent)