Please explain in detail. thanks :)

4) a) At t = 0 you deposit $100 in the bank, where the APR is Z. Two years later at t = 2, you have $121. What is the EAR? b) The APR is X with semi-annual compounding. The EAR is 12%. What is X? c) The monthly interest rate is 1%. What is the EAR? d) A bank tells you that for the first 6 months, your money will get multiplied once by a factor of 1.02, and that for the second 6 months your money will get multiplied once by a factor of 1.03. Another bank tells you that their APR is Z with monthly compounding. If you have to leave your money in either bank for a full year, for what value of Z are you indifferent between the two banks