For Fixed Int Bonds start either start with a rate above or below(1-2% just to be sure) the coupon rate . Then you need to alter the rate depending on the effect it has on the price. If the price is higher than what's required, choose a lower rate, but if the price is lower than what''s required,then you need to increase your rate. If the first guess satisfies the equation, then you don't have to interpolate.But when you do interpolate just make sure that the interest rates you choose increase or decrease in steps of 0.005,i.e it's better to interpolate between 4 and 4.5% rather than 5%.
Hope this helped!
Kind regards
Sanjay
Last edited by a moderator: Apr 9, 2014