could you please explain thoroughly how to solve it, I have a ready answers but dont know how they got it?

On 1 January 2016 Gump issues a five-year debenture stock with a par value of 1,000,000. The coupon rate of interest is 2.2% on the par value, payable annually on 31 December. The debenture is redeemable at 01.00 on 31 December 2020. The proceeds of issue are 836,500 a. How would the debenture be accounted for following the effective interest method set out in IAS 39 and FRS 4? (The implicit percentage rate of interest should be estimated to the nearest whole number.) b. What are the comparative merits and disadvantages of this method? c. Interest rates rise after 2017. On 31 December 2018, after the interest for that year has been paid, the market value of the debentures (ex int) reflects the current required yield of 10%. There is no general expectation of either a further rise or a fall in interest rates for the foreseeable future. d. Should Gump buy in the debentures? e. If it does, how should the transaction be reflected in the company's accounts? nes On 1 January 2016 Gump issues a five-year debenture stock with a par value of 1,000,000. The coupon rate of interest is 2.2% on the par value, payable annually on 31 December. The debenture is redeemable at 01.00 on 31 December 2020. The proceeds of issue are 836,500 a. How would the debenture be accounted for following the effective interest method set out in IAS 39 and FRS 4? (The implicit percentage rate of interest should be estimated to the nearest whole number.) b. What are the comparative merits and disadvantages of this method? c. Interest rates rise after 2017. On 31 December 2018, after the interest for that year has been paid, the market value of the debentures (ex int) reflects the current required yield of 10%. There is no general expectation of either a further rise or a fall in interest rates for the foreseeable future. d. Should Gump buy in the debentures? e. If it does, how should the transaction be reflected in the company's accounts? nes