hi i don't understand for question b #3 & 4

Having thought about Mr. Jamess suggestion, you consider several options as an estimate of lost profits. These include 1) the full year, 2) the last six months only, 3) a weighted average that gives twice the weight to the last six months as to the first six months, or 4) some other weighted average. Which method do you think gives the most accurate estimate of lost profits?