Ben and Eileen went on a field trip with some freinds, some of whom had a cold. The probability that Ben will catch the cold is $0\mathrm{.}09$ and the probability that Eileen will catch the cold is $0\mathrm{.}21.$ What is probability that neither Ben nor Eileen will catch the cold? Use the information given in the question to determine the probability that at least one of them catches the cold.