Problem involving Simple and Compound Interest

Peter deposits \(\$7680\) in a fund that pays compound interest of \(3.35\%\) per annum,
compounded half-yearly.

Calculate the total amount of money that Peter will have in the fund at the end of five years.

At the end of five years, Peter withdrew \(\$6500\) from the fund and invested this
amount in a bank which offered simple interest rate of \(4.8\%\) per annum.

Find the minimum number of full years he had to leave the money in a bank in order for it to be more than \(\$12000\).