PLEASE help with 19 and 20.

19-you are offered the following prize. $10,000 at the end of the first year, $25,000 at the end of the second year and $50,000 at the end of the third year. What is the present value of this mixed stream using 7% interest? 20-you have borrowed $95,000. You are going to pay it back over 5 years at 5% interest. What is the annual payment needed to pay off the loan over 5 years