Oh i suddenly figure out what i missed. Sld the cash flow for part (b) be as follows: Year0:(100) 1:40.45 2:40.45 3:40.45 4:40.45 5:40.45 6-infinity:0.45(p.a.) For Year1-5, discounted by 18.2%(calculated WACC) and also need to add 0.45/(18.2%)? So total gain for Part(b)=28.4? Pls advise if i find the correct answer, thanks! :