please exain to me how to do this problem with the financial calculator HP10bII+

A 20 -year bond has an 7.0% coupon rate and face value of $1000. The yield to maturity is 10%. What is the percentage change in the price of this bond if interest rates rise by 2% ? Assume the bond makes semiannual. coupon payments. Approximately 16% increase Approximately 38% increase Approximately 2% decrease Approximately 16% decrease Approximately 38% decrease