project 18 starting with 17, we headed over here on 17 and I left clicked and held down control and dragged it over and renemed this tab project 18 $1,000 advertising right down here, project 18 $1,000 advertising then I go up here and add it to the fixed cost, I'm adding this, insert a row in here and I'm going to call it advertising and $1,000 all the way across, right that changed all my numbers but according to research according to the problem, the first $1,000 you spend for this type of seminar you get 5% increase in attendance so right here instead of the one we started with before 87 or 88% almost we are going to change it to 1.05 that multplies all the attandence figures by 1.05 and hit enter so now we are making $529 without any advertising we would have to try it with the one, see how much that is the $503,000 and then when it change it to, all the numbers change in the whole spreadsheet 1.05 so that's $529,000 so copy this over again 