16. The common cold is a viral infection in which 70% of all cases are mainly due to Rhinovirus, 15% are mainly due to Coronavirus, 10% mainly due to influenza and 5% mainly due to other viruses. Often, more than one virus is present. If 90% of the world population (7,000,000,000) suffers from the common cold at least once a year, how many individuals are infected with the Rhinovirus?