Example: Robin deposits $4,300 into an account on March 1, 1998. The bank guarantees that the annual effective rate for the balance under $5,000 is 3.5% and for the balance over $5,000 is 5%. Suppose that there is no other deposits or withdrawals except for one withdrawal of $1,000 on March 1, 2003 and a deposit of S500 on March 1, 2004. Then find his account balance on March 1, 2006