Please show your work! I really want to understand this question fully :)

13. Use your Unit 1 math to see what happens to bond prices when interest rates change. Assume that current interest rates are 3%. What happens to the price of a 10-year zero coupon bond when rates rise to 4% from 3%? When raise fall from 3% to 2%? Why? Discuss what happens to bond prices for 10- and 20-year bonds in the situations noted in Part (a)