Great Grains Cereal Company is about to market a new low-carbohydrate cereal in a city of 5,000,000 people. They plan an advertising campaign that they think will induce 30% of the people to buy the product. They estimate that if those people like the product, they will induce 30, ∙ 30, ∙ 5,000,000 more to buy the product, and those will induce 30, ∙ 30, ∙ 30, ∙ 5,000,000, and so on. In all, how many people will buy the product as a result of the advertising campaign? What percentage of the population is this?