2. A sum of money was deposited on 2 January 2007 in an investment fund which
offered 10% simple interest. On 30 June 2007, 12499 was withdrawn from the
fund. Find the initial deposit using Banker's rule.(11906.96)

3. Four years ago, X was invested at a simple interest rate of 5% per annum.
Today 2540 is withdrawn and the balance in the account is 2600. Calculate
the value of X.(4283.33)​