can somebody help me with this question? thanks.

1.2 Suppose you bought a year ago a $10,000 ten-year treasury note with $400 annual coupon, i.e., interest rate of 4% per annum compounded annually. You have already received the first coupon payment, so you are holding in effect a $10,000 treasury note with nine-year maturity. Suppose further that the market interest rate on nine-year treasury notes has now gone up to 5% (again, per annum with annual compounding) What is your treasury note worth? How much would it be worth if the interest rate had instead gone down to 3%