What is the present value of a string of payments of $119 received monthly over 30 years if the annual interest rate is 4%, 6%, 8%, 10%, or 12%?

If you were retiring, would you prefer $300,000 now or $2,000 per month for 20 years? What is the present value of the payments? You think that you can earn 5% on the money.

What is the present value of a lump sum payment in 5 years of $100,000 is the interest rate is 5%?