c) An amount of $10,000 is invested in a bank account for three and a half years. The account pays interest at 6% p.a. compounded half yearly for the first 2 years, then at a 7% p.a. compounded quarterly for 18 months. How much is the account at the end of three and a half years if no withdrawals are made? (Round your answer to the nearest cent.) (3 marks)