please help me with these questions

11) If a three-year term deposit at the bank pays an interest rate of 9%, how much will have to be deposited to earn $800 of interest? 12) An eligible individual may decide to start collecting the Canada Pension Plan (CPP), a monthly retirement pension, at any time between the ages of 60-65. The average life expectancy of a person aged 60 years is another 25 years. If you expect to be paid $1000/month during your retirement, how much CPP must you have at the time of retirement to receive $1000/month over the next 25 years of your life? Assume that money is worth 4% compounded monthly. 13) Bob deposited $25000 into a savings account that pays 4.5% interest. If Bob leaves the money in the account, how much will he have in 30 years? What is his ROI