Please do not post pictures from a Revision Kit – they are copyright material and so it is illegal for us to have pictures of them here.
How to solve these questions is explained in detail in my free lectures on investment appraisal – you cannot expect me to type out all of my lectures here 🙂
Obviously you have answers in your Revision Kit, and so ask about whatever it is in the answers that you are not clear about – then I will help you.
(Assuming that it is a current edition of the Revision Kit, then all you need do is give the number of the question 🙂 )