Can you provide the steps and explanation for this question? Thanks

7. In early 2018 TD Ameritrade participated with The Goldman Sachs Group, Inc. to sell a bond with the following characteristics: . Coupon: 2.50% to 03/29/2019; 3.50% to 03/29/2020; 4.00% to 03/29/2021. . Payment Frequency: Semi-Annually. . Maturity: 03/29/2021. Use your knowledge of annuity formation using perpetuities to derive a closed-form solution for the price of this bond on 03/29/2018