In exam suppose we calculate NPV @10% cost of capital and dNPV is +5000 and then we calculate @12% and NPV is +700 ..can we take these two value to calculate IRR ? OR IS IT COMPULSORY TO TAKE ONE +VE AND ONE -VE VALUE ? i read in one solution of BPP kit that linear interpolation gives more accurate value then linear exptrapolation ..but i didnt understand what that means. Thanks
Having one negative and one positive NPV does give a better approximation, but for the exam that does not matter – by all means calculate it if you have two positive values.