A study of a cohort of 1,000 newborn animals showed a death rate per individual in year one of 40 percent and a death rate per individual in year two of 80 percent.The quantity of survivors after two years is about

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In the first year, 40% of 1,000 animals die, leaving 60% surviving, which is 600 animals. In the second year, 80% of the remaining 600 animals die, leaving 20% surviving, which is 120 animals.

A Study of a Cohort of 1,000 Newborn Animals Showed