Proctor and Gamble has been running a television advertisement for its Crest-brand toothpaste products. When a survey was conducted, 0.80 of the individuals surveyed had purchased a Crest product, 0.20 of the individuals surveyed had recalled seeing the advertisement, and 0.10 of the individuals surveyed had purchased a Crest product and recalled seeing the advertisement. What proportion of the individuals surveyed who recalled seeing the advertisement had purchased a Crest product?