please help with the two question. and would it be possible to indicate when I should use EAR with Rnom or Rper(periodic rate)

2 Suppose that you are offered the opportunity to buy an ordinary annuity that pays $1,000 per year for 5 years. Your opportunity cost rate is 8% compounded quarterly. First payment is to be received in one year from now. How much would you be willing to pay? 3 Suppose your opportunity cost rate is 12% compounded monthly, but you receive a three-year annuity paid $100 at the end of each year. What is the most you would pay for this annuity