The population of a city doubles during the workday. at the end of the workday, the population decreases by half. if the population of the city is roughly 4,000,000 people before “rush hour”, and the morning rush hour actually lasts 3 hours, what would be the population 12 hours after the start of the rush hour if the population continued to double every 3 hours? people leave the city for home at the same rate as they come into the city. if there are 8,000,000 people in the city during the workday, what would be the population 12 hours after the start of the evening rush hour, which lasts 3 hours, if the population continued to be cut in half every 3 hours?