good madam/sir this is financial mathematics non level annuities please help

Since June 30, 2007 Elizabeth has been making deposits of N$100 each into a bank account on the last day of each month. For all of 2007 and 2008 Elizabeth's account earned nominal interest compounded monthly at an annual rate of 9%. For the first 9 months of 2009 the account earned 2012) 0.105, and the account has been enrning (12) = 0.12. (a) Find the balance in the on each of the following days: (1) January 1 2008, (ii) January 1, 2009, and (iv) February 1, 2010 (b) Find the amount of interest credited on February 28, 2010