QF Corporation (Pvt) Ltd is a growing organization in the industry and is showing progress in terms of capturing new markets in the industry. QF have observed the interest rate decrease from 11% to 9% suddenly.

 Find the present values of the bond A before the change. If the bond A has maturity of 7 years, with coupon rate of 10%.                                             

Find the present values of the bond A after the change. If the bond A has maturity of 7 years, with coupon rate of 10%.                                                 

 Find the present values of the bond B before the change. If the bond B has maturity of 10 years, with coupon rate of 10%.                                               

Find the present values of the bond B after the change. If the bond B has maturity of 10 years, with coupon rate of 10%.